# Joint Estimation of the Characteristics and Intensity of Poverty in Spain: The Case of Imputed Rent

Authors: José L. Calvo; Cristina Sánchez; Pedro Cortiñas
Journal: Economics Research International
 (2010)

---

## Abstract

In 2007 the Spanish National Institute of Statistics modified the methodological
approach to the Survey of Income and Living Conditions and included an estimate of Imputed
Rent. It removes one of the main criticisms of Spanish poverty studies since this variable is
associated with home ownership, and because more than 80% of Spanish families are
homeowners, its exclusion biased the estimates of the size of Spain's poor population and
poverty intensity. We estimate a Heckman model with a selection equation in which the
dependent variable is the probability of being poor, and a truncated regression to explain
poverty intensity. Our findings have at least two economic policy implications: Spanish social
policy against poverty should take into account geographical differences but, at the same time,
should consider Imputed Rent. Without this variable efforts should concentrate in Spanish less
developed regions and rural areas, but if we include it poverty increases in urban population.
The article has also reveals that most retired people cannot be considered poor if we take into
account wealth (imputed rent included) instead of current income (pension).


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## Body

## 1. Introduction

Poverty has always been an important area of study in Spanish Economic Science. From Plan [1] to Calvo and Sánchez [2], many authors have analyzed family income to assess the number and characteristics of poor people in Spain. Very different results emerge, as summarized in Table 7.The main criticism of Spanish poverty studies stems from the calculation of household income. Until 2007, the Spanish Statistics on Income and Living Conditions (SILC) did not include an estimate ofImputed Rent (IMRENT)(INE [3]). This variable is  associated with home ownership, and because more than 80% of Spanish families are homeowners, its exclusion biases the results. (Sánchez [4] obtains that without taking into account IMRENT 60% of Spanish poor are house owners with their house already paid. Their relative contribution to poverty reaches 1.9 (reference value=1)). In fact, Calvo and Sánchez [2] show that the characteristics of Spain’s poor population change dramatically depending on whether Imputed Rent is considered. (In this paper we conduct a descriptive analysis comparing the situation of different household’s classifications depending on the inclusion or not of IMRENT. At the same time we estimate a probit model to calculate the probability of leaving poverty when the variable is considered. The results show the relevance of this proxy to households’ wealth since its incorporation changes the profile of Spanish poor: if we do not consider it, most people older than 65 are under the poverty line, especially women. But if we include it, a big share of widows and retired people rise above the poverty line. We also obtain a positive effect of being a home owner or paying a mortgage).The Spanish National Institute of Statistics (INE) modified the methodological approach to SILC in 2007 and included, for the first time, an estimate ofImputed Rent. This made it possible to compare the characteristics of the Spanish poor using the traditional methodology, (without this variable), with a new approach (incorporating it).As Amartya Sen [5] points out, there are at least, two different problems in poverty measurement: firstly we need to identify the share of the population that could be classified as poor. That requires us to define a criterion, usually the poverty line, to separate poor people from the rest of the population. Secondly, we need to analyze the situation of people who fall under that threshold.The methodology we follow in this article considers these two strategies. In doing so, we select the family, or more accurately, the household as the analysis unit. Secondly, we work with apoverty line obtained from an economic variable, the income per unit of equivalent consumption (IUEC), using European criteria. To work out IUEC we employ modified OECD equivalence scales and we establish the poverty line as 60% of IUEC median. Additionally, income is calculated in two ways: with and without Imputed Rent.Thirdly, we analyze the characteristics and situation of people under the poverty line.To jointly study the determinants of being under the poverty line and the characteristics of the poor, we estimate a Heckman model that includes two equations. In the first equation—the selection equation—we test the variables that explain if a family can be considered poor or not. The second equation is the truncated regression where the explained variable is the distance from the household’s IUEC to the poverty line with family variables defining the characteristics of the poor population and poverty intensity.The article is structured as follows: Section2 describes the data we have employed and the methodology applied to calculate the household income per unit of equivalent consumption. Section 3 establishes the main characteristics of Spanish poor and calculates some poverty indexes for Autonomous Communities. Section 4 discusses the model. Section 5 estimates a Heckman model for both cases, with and without IMRENT and comments on the results. The final sections offer the conclusions and a discussion about some social policy implications.


## 2. Data

### 2.1. The Living Conditions Survey

Database comes from the Living Conditions Survey (LCS) conducted by the Spanish Statistics National Institute (INE) (http://www.ine.es/daco/daco42/condivi/ecv_metodo.pdf). This survey is included in a European project—the European Union Statistics on Income and Living Conditions (EU-SILC). Its main goal is to provide a reference source on comparative statistics on the distribution of income and social exclusion in the European environment.EU-SILC is a systematic production of Community statistics on income and living conditions that include transversal and longitudinal data that are comparable and updated on income, the level and composition of poverty and social exclusion, on a national and European level. There is no obligation of using a specific model, but the response must provide certain transversal and longitudinal information using the instruments each Member State considers appropriate.Although the data refer to both the transversal and longitudinal dimension, priority is granted to the production of high-quality transversal data as regards punctuality and comparability. The longitudinal component allows the survey to follow the same persons over a period of time, studying the changes produced in their lives when the conditions and socioeconomic policies are modified, and how they react to these changes. Since the efficiency of the political measures is very influenced by the manner in which the interested parties react to them, the SILC will provide extremely relevant information on the effects of the socioeconomic policies in the framework of the Single Market.The LCS is a “Rotating Panel” survey. That is to say, since it is a panel it investigates the same units over the years. In the LCS, the panel units are only investigated for four years. The sample is composed by 4 panel subsamples. Therefore, every year, one is replaced by a new subsample. Each of the subsamples will remain in the survey for four years, after this period it is replaced by another subsample.The survey uses the census definition given for a family dwelling, considering the census section as the primary census section sample and the main family dwelling as the last sample unit. Initially, the selected sample includes all private households resident in the main family dwellings selected.After selecting a target population, and considering that persons live in dwellings composing private or group households (or reside in institutions), monitoring is performed via households, since as well as there being information on them for their location, they will also be considered study units, as the survey does not only study the behaviour of the individuals specifically, but also the behaviour of the households as a whole.In order to select each subsample of the LCS, a two-stage design is used with first stage unit stratification. The first stage is formed by census sections and the second stage by main family dwellings. Within these no subsampling is carried out, investigating all dwellings that are their usual residence.The framework used for the sample selection is an area framework formed by the relation of existing census sections used in the 2003 Municipal Register of Inhabitants. Second stage units use the list of main family dwellings in each of the sections selected for the sample.The first stage units are grouped into strata in agreement with the size of the municipality to which the section belongs.The following strata are considered.(i)
Stratum 0: Municipalities with more than 500.000 inhabitants.(ii)
Stratum 1: Province capital municipality (except the previous ones).(iii)
Stratum 2: Municipalities with more than 100,000 inhabitants (except the previous ones).(iv)
Stratum 3: Municipalities from 50,000 to 100,000 inhabitants (except the previous ones).(v)
Stratum 4: Municipalities from 20,000 to 50,000 inhabitants (except the previous ones).(vi)
Stratum 5: Municipalities with 10,000 to 20,000 inhabitants.(vii)
Stratum 6: Municipalities with less than 10,000 inhabitants.For each Autonomous Community, an independent sample that represents it is designed, due to one of the objectives of the survey being to facilitate data. In order to achieve the goals set out for the survey to provide estimates with an acceptable level of reliability on a national and Autonomous Community level, the sample selected includes 16,000 dwellings distributed in 2,000 census sections. The sample is distributed between Autonomous Communities assigning a portion uniformly and another in proportion to the size of the Community. The uniform part corresponds to approximately 40% of the sections.


### 2.2. The Calculation of Poverty Line

We employed data from the LCS in 2007 (observations from 2006). It has a sample of 12,329 observations representing 16,116,202 Spanish households. (We dropped households with negative or zero income).The most important methodological change INE introduced in the 2007 LCS was to take into accountImputed Rent. This variable refers to the value that would be attributed to any household that did not declare it paid a complete rent, whether the family is occupant-owner, lives in a house rented at a price lower than market price, or occupies the house free of charge. This Imputed Rent is only calculated for homes—and other associated places such as garages—used as the main residence.The value attributed is obtained from the market rental paid for a similar home, taking into account several points: if the home is rented below market price, then the rent actually paid is subtracted. If the tenant receives any Administration or economic aid, it is subtracted. If the family is the owner, we deduct any Administration or economic aid as well as maintenance or renovation expenditures. As for the market rental, it is the amount that should be paid for an unfurnished home in the private market without including home expenses.Imputed Rentadds to other revenues to obtain total family’s income. (In Calvo et al. [6] total household income as well as income per unit of equivalent consumption without Imputed Income are worked out. Sánchez [4] calculates personal income with and without IMRENT.) In order to calculate the income per unit of equivalent consumption, we divide total family’s income by the number of members of the household using modified OECD equivalence scales. Its formula is(1)eh=1+0,7(ah-1)+0,5mh,
where eh is the equivalent scale, ah the number of adults in household h, and mh the number of children under 16 years.We define thepoverty linefollowing EUROSTAT criterion as 60% of the median of IUEC. Therefore, those families whose income per unit of equivalent consumption is under the 60% of the distributional median are classified as poor households.


## 2.1. The Living Conditions Survey

Database comes from the Living Conditions Survey (LCS) conducted by the Spanish Statistics National Institute (INE) (http://www.ine.es/daco/daco42/condivi/ecv_metodo.pdf). This survey is included in a European project—the European Union Statistics on Income and Living Conditions (EU-SILC). Its main goal is to provide a reference source on comparative statistics on the distribution of income and social exclusion in the European environment.EU-SILC is a systematic production of Community statistics on income and living conditions that include transversal and longitudinal data that are comparable and updated on income, the level and composition of poverty and social exclusion, on a national and European level. There is no obligation of using a specific model, but the response must provide certain transversal and longitudinal information using the instruments each Member State considers appropriate.Although the data refer to both the transversal and longitudinal dimension, priority is granted to the production of high-quality transversal data as regards punctuality and comparability. The longitudinal component allows the survey to follow the same persons over a period of time, studying the changes produced in their lives when the conditions and socioeconomic policies are modified, and how they react to these changes. Since the efficiency of the political measures is very influenced by the manner in which the interested parties react to them, the SILC will provide extremely relevant information on the effects of the socioeconomic policies in the framework of the Single Market.The LCS is a “Rotating Panel” survey. That is to say, since it is a panel it investigates the same units over the years. In the LCS, the panel units are only investigated for four years. The sample is composed by 4 panel subsamples. Therefore, every year, one is replaced by a new subsample. Each of the subsamples will remain in the survey for four years, after this period it is replaced by another subsample.The survey uses the census definition given for a family dwelling, considering the census section as the primary census section sample and the main family dwelling as the last sample unit. Initially, the selected sample includes all private households resident in the main family dwellings selected.After selecting a target population, and considering that persons live in dwellings composing private or group households (or reside in institutions), monitoring is performed via households, since as well as there being information on them for their location, they will also be considered study units, as the survey does not only study the behaviour of the individuals specifically, but also the behaviour of the households as a whole.In order to select each subsample of the LCS, a two-stage design is used with first stage unit stratification. The first stage is formed by census sections and the second stage by main family dwellings. Within these no subsampling is carried out, investigating all dwellings that are their usual residence.The framework used for the sample selection is an area framework formed by the relation of existing census sections used in the 2003 Municipal Register of Inhabitants. Second stage units use the list of main family dwellings in each of the sections selected for the sample.The first stage units are grouped into strata in agreement with the size of the municipality to which the section belongs.The following strata are considered.(i)
Stratum 0: Municipalities with more than 500.000 inhabitants.(ii)
Stratum 1: Province capital municipality (except the previous ones).(iii)
Stratum 2: Municipalities with more than 100,000 inhabitants (except the previous ones).(iv)
Stratum 3: Municipalities from 50,000 to 100,000 inhabitants (except the previous ones).(v)
Stratum 4: Municipalities from 20,000 to 50,000 inhabitants (except the previous ones).(vi)
Stratum 5: Municipalities with 10,000 to 20,000 inhabitants.(vii)
Stratum 6: Municipalities with less than 10,000 inhabitants.For each Autonomous Community, an independent sample that represents it is designed, due to one of the objectives of the survey being to facilitate data. In order to achieve the goals set out for the survey to provide estimates with an acceptable level of reliability on a national and Autonomous Community level, the sample selected includes 16,000 dwellings distributed in 2,000 census sections. The sample is distributed between Autonomous Communities assigning a portion uniformly and another in proportion to the size of the Community. The uniform part corresponds to approximately 40% of the sections.


## 2.2. The Calculation of Poverty Line

We employed data from the LCS in 2007 (observations from 2006). It has a sample of 12,329 observations representing 16,116,202 Spanish households. (We dropped households with negative or zero income).The most important methodological change INE introduced in the 2007 LCS was to take into accountImputed Rent. This variable refers to the value that would be attributed to any household that did not declare it paid a complete rent, whether the family is occupant-owner, lives in a house rented at a price lower than market price, or occupies the house free of charge. This Imputed Rent is only calculated for homes—and other associated places such as garages—used as the main residence.The value attributed is obtained from the market rental paid for a similar home, taking into account several points: if the home is rented below market price, then the rent actually paid is subtracted. If the tenant receives any Administration or economic aid, it is subtracted. If the family is the owner, we deduct any Administration or economic aid as well as maintenance or renovation expenditures. As for the market rental, it is the amount that should be paid for an unfurnished home in the private market without including home expenses.Imputed Rentadds to other revenues to obtain total family’s income. (In Calvo et al. [6] total household income as well as income per unit of equivalent consumption without Imputed Income are worked out. Sánchez [4] calculates personal income with and without IMRENT.) In order to calculate the income per unit of equivalent consumption, we divide total family’s income by the number of members of the household using modified OECD equivalence scales. Its formula is(1)eh=1+0,7(ah-1)+0,5mh,
where eh is the equivalent scale, ah the number of adults in household h, and mh the number of children under 16 years.We define thepoverty linefollowing EUROSTAT criterion as 60% of the median of IUEC. Therefore, those families whose income per unit of equivalent consumption is under the 60% of the distributional median are classified as poor households.


## 3. Poverty in Spain

### 3.1. Main Characteristics

The median of Spanish households’ IUEC in 2007 was 11,900€ per year without Imputed Rent and 14,723.35€ per year if we include Imputed Rent. This means that the poverty line is established in 7,140€ without IMRENT, but at 8,834.01€ with IMRENT included. The results for the Spanish population are summarized in Table 1.Table 1
Main features of poverty in Spain.
HouseholdsWithout imputed rentWith imputed rentMedian of income per unit of equivalent consumption11,900€/year14,723.35€/yearPoverty line 60% of the median7,140€/year8,834.01€/yearHouseholds with IUEC under the poverty lineAbsolute ValueShare (%)Absolute ValueShare (%)3,189,622202,223,00114Source: drawn up by authors from INE (2007)  [3].As we can see in Table1, incorporation of IMRENT leads to a reduction in the size of the Spanish poor population. If we do not consider this variable, the share of poor households rises to 20%, with more than 3 million families under the poverty line. If we include Imputed Rent, the proportion of the households living in poverty drops to 14% and the total number of households with IUEC smaller than 60% of the median decreases by almost one million.In fact, incorporation of IMRENT creates changes in two directions: some households move from being poor when we do not consider this variable to being over the poverty line when we include it, and visa versa. Table2 summarizes those changes.Table 2
Change in the number of households in poverty changes due to the inclusion of IMRENT.
With IMRENTPoorNo poorWithout IMRENTPoor2,036,696 (12.8%)1,152,926 (7.2%)No poor186,304 (1.2%)12,597,519 (78.9%)Source: drawn up by authors from INE (2007)  [3].More than one million Spanish households (1,152,926)rise above the poverty line when we include IMRENT in their Income per Unit of Equivalent Consumption, and only 186,304 drop below the poverty line. The incorporation of imputed rent significantly changes one’s estimate of the size of Spain’s poor population.The other question related to the measurement of poverty we mentioned in theIntroduction is the situation of people under the poverty line. Because that threshold changes when we introduce IMRENT, as we have seen in Tables 1 and 2, it is logical that the characteristics of Spanish poor households also change. Table 3 classifies the poor into four groups depending on poverty intensity: those close to poverty line—between 45% and 60% of the median—are the social precariousness, moderate poverty contains Spanish poor households with an Income per Unit of Equivalent Consumption between 44% and 30%, severe poverty includes those households with IUEC between 29 and 15%, and extreme povertytake into account of those with less than 15%.Table 3
Spanish poverty intensity depending on the inclusion or not of IMRENT.
% of the medianIUEC (€per year)NumberShare of spanish poorWithout IMRENTSocial precariousness (45–60%)5,355 to 7,1401,795,49556.3Moderate poverty (30–44%)3,570 to 5,354.90905,34528.4Severe poverty (29–15%)1,785 to 3,569.90349,96611.0Extreme poverty (Less than 15%)Less than 1,785138,8164.3With IMRENTSocial precariousness (45–60%)6,625.51 to 8,8341,421,31363.9Moderate poverty (30–44%)4,417.00 to 6,625.50569,55225.6Severe poverty (29–15%)2,208.50 to 4,416.90185,1278.3Extreme poverty (Less than 15%)Less than 2,208.5047,0082.1Source: drawn up by the authors.As we see in Table3, the inclusion of IMRENT not only reduces the number of Spanish poor, but also changes the distribution of that population. The share of people in extreme poverty decreases by more than two percentage points from 4.3% to 2.1% and the population close to the poverty line increases from 56.3% to 63.9%. These two results are very relevant: more than one-half of Spain’s poor are very close to the “threshold” of overcoming poverty with a relative small effort. On the other side, the introduction of IMRENT reduces to 47,000 the number of households that are far away from the poverty line.


### 3.2. Poverty Indexes by Autonomous Communities

We have thought that it should be interesting to briefly analyze the very heterogeneous situation of Spanish poverty depending on the Spanish Autonomous Community the household sited, since location will be a relevant variable in the estimation of next sections. Therefore, we have calculated the following indexes.(1)
Head count ratio(H): defined as the share of poor people (q,number of people under poverty line) in the population (n).(2)H=qn.
This is the principal measure used in poverty studies because of its simplicity. Nevertheless, it is not sensitive to the degree of poverty. In fact, it is independent of the poor distribution(2)
Income gap ratio (I), calculated as(3)I=∑i=1q(z-yi)qz=1-μpz,
where z is poverty line, y1…yq are households incomes per unit of equivalent consumption under the poverty line, and μp is the mean of those incomes. This index complements H. It is not sensitive to the share poor people represent in total population, just the contrary of H. (3)
Poverty gap ratio (HI):(4)HI=∑i=1q(z-yi)nz=qn-(∑i=1qyinz)=H(1-∑i=1qyinz)=HxI.Combination ofH and I, it takes into account at the same time the share of poor people in the population and the degree of poverty. It measures the necessary amount of income to position all the poor on poverty line, divided by the product of total population by the poverty line (nz). (4)
Percentage Contribution to Poverty(CPI), measured as(5)CPI=(niNIiI)×100,
where now N is Spanish population, ni are the inhabitants of the ith Spanish Autonomous Community, Ii is the income gap ratio for the same Community, and I is the Spanish income gap ratio. (5)
Relative Contribution to Poverty (CRI):(6)CRI=(IiI),
with Ii the income gap ratio in the ith Community and I the Spanish income gap ratio. If CRI is bigger than 1, then there is an overrepresentation of that CC.AA. in poor population, showing that the situation of that Community is worse than Spanish mean; on the contrary, if CRI is smaller than 1, then the Community is underrepresented and it is better off than the mean.(6)
Sen index(S):(7)S=H[I+(1-I)G],
a combination of Head Count Ratio (H), Income Gap Ratio (I), and Gini’s coefficient (G).Sen [5] was looking for a poverty index observing three axioms: (a) it only depends on poor households’ incomes, meaning that the income of nonpoor people and its changes do not affect the index; (b) it increases when the poor’s income decreases; and (c) it is sensitive to changes in poor people’s distribution. H and I satisfy the first axiom; I satisfy the second one but not H; and neither I nor H satisfies the third. On the contrary, a measure of inequality, Gini’s coefficient, satisfies all of them. Therefore, Sen Index includes information about the poor, poverty intensity, and a measure of inequality between poor households, since Gini’s coefficient is worked out taking only into account people under poverty line.  (7)
The family ofFoster, GreenandThorbecke  Indexes(FGT):(8)FGTα(y;z)=1n∑i=1q(z-yiz)α-1α>0.
These indexes consider the relative importance of income distance to poverty line. They weight poverty deficits. Those weights depend on the household’s income distance to poverty line. α is known as poverty aversion parameterand the bigger this parameter more relevance is attributed to poorest families.Ifα=1, the FGT index is identical to H;Ifα=2, it is HI;Ifα=3, the expression is(9)FGTα=3(y;z)=1n∑i=1q(z-yiz)2=H[I2+(1-I)2CV2],
with CV being the poor’s variation coefficient.Finally, ifα=4, the correspondent index is(10)FGTα=4(y;z)=1n∑i=1q(z-yiz)3.
It is employed when the researcher wants to emphasize the relevance of the poorest.(8)
Hagenaarsindex (HAG):(11)HAG(y,z)=qn[log⁡z-log⁡μlog⁡z].μ is the geometric mean of income per unit of equivalent consumption. This index considers information about the share of poor on total population along with an aggregated measure of poverty degree. The value of the index rises with poor people’s income distance to poverty threshold (there is a positive relationship between index value and the distance).The results are included in Tables4 and 5.Table 4
Poverty indexes by autonomous community (I).
(*)Without IMRENTWith IMRENTHIH*ICPICRIHIH*ICPICRIAndalucía0,2850,2740,07816,771,0040,1980,2250,04516,390,981Aragón0,1480,2660,0392,880,9730,1030,2310,0242,971,007Asturias0,1540,2340,0362,180,8580,1110,1900,0212,110,828Canary Islands0,2720,3050,0834,821,1180,2290,2190,0504,120,955Castilla-La Mancha0,3230,2580,0843,960,9460,2360,2100,0503,840,918Castilla and León0,2550,2820,0726,091,0320,1780,2390,0436,171,044Catalonia0,1340,2660,03615,990,9740,0950,2380,02317,081,040C.A. Ceuta and Melilla0,2510,4100,1030,401,5020,2370,3440,0810,391,501Madrid0,1200,2660,03213,140,9730,0670,2810,01916,561,226C. Valenciana0,1780,2640,04710,770,9650,1180,1970,0239,570,858Extremadura0,4030,2800,1132,421,0260,3620,2240,0812,310,978Galicia0,2240,2830,0636,241,0360,1530,2410,0376,331,052Balearic Islands0,1590,2770,0442,461,0150,0960,2540,0242,691,107La Rioja0,1900,2570,0490,680,9410,1540,1840,0280,580,803Navarre0,0760,1830,0140,930,6700,0490,1750,0091,060,764Basque Country0,1270,2880,0375,261,0560,0770,2170,0174,720,948Murcia0,2590,2840,0743,011,0400,1650,2770,0463,501,209TOTAL0,2000,2730,055100,001,0000,1390,2290,032100,001,000Source: drawn up by authors from LCS (2007).Table 5
Poverty indexes by autonomous community (II).
(*)Without IMRENTWith IMRENTGSFGT3FGT4HAGGSFGT3FGT4HAGAndalucía0,1720,1140,0350,0200,0130,1270,0640,0160,0080,006Aragón0,1890,0600,0180,0110,0070,1180,0330,0090,0040,003Asturias0,1410,0530,0140,0070,0050,1260,0320,0070,0040,003Canary Islands0,1770,1160,0380,0220,0150,1310,0740,0200,0110,009Cantabria0,1370,0490,0120,0060,0050,1640,0290,0060,0030,002Castilla-La Mancha0,1400,1170,0320,0150,0120,1160,0710,0170,0070,007Castilla and León0,1790,1050,0340,0210,0120,1390,0610,0180,0100,007Catalonia0,1600,0510,0160,0090,0060,1580,0340,0100,0050,003C.A. Ceuta and Melilla0,2690,1430,0590,0390,0200,2230,1160,0450,0290,014Madrid0,1660,0460,0150,0080,0050,1840,0270,0090,0050,003C. Valenciana0,1690,0690,0220,0130,0080,1250,0350,0080,0040,003Extremadura0,1450,1550,0470,0250,0180,1260,1170,0300,0140,011Galicia0,1700,0910,0290,0160,0100,1420,0530,0150,0070,005Balearic Islands0,1860,0650,0220,0140,0080,1130,0320,0090,0050,004La Rioja0,1510,0700,0200,0110,0080,1230,0440,0100,0050,004Navarre0,1340,0220,0060,0040,0030,1120,0130,0030,0020,001Basque Country0,2130,0560,0190,0120,0070,1290,0250,0060,0030,002Murcia0,1780,1070,0350,0210,0130,1500,0640,0200,0120,007TOTAL0,1720,0790,0250,0140,0090,1400,0470,0130,0060,005Source: drawn up by authors from LCS (2007).


## 3.1. Main Characteristics

The median of Spanish households’ IUEC in 2007 was 11,900€ per year without Imputed Rent and 14,723.35€ per year if we include Imputed Rent. This means that the poverty line is established in 7,140€ without IMRENT, but at 8,834.01€ with IMRENT included. The results for the Spanish population are summarized in Table 1.Table 1
Main features of poverty in Spain.
HouseholdsWithout imputed rentWith imputed rentMedian of income per unit of equivalent consumption11,900€/year14,723.35€/yearPoverty line 60% of the median7,140€/year8,834.01€/yearHouseholds with IUEC under the poverty lineAbsolute ValueShare (%)Absolute ValueShare (%)3,189,622202,223,00114Source: drawn up by authors from INE (2007)  [3].As we can see in Table1, incorporation of IMRENT leads to a reduction in the size of the Spanish poor population. If we do not consider this variable, the share of poor households rises to 20%, with more than 3 million families under the poverty line. If we include Imputed Rent, the proportion of the households living in poverty drops to 14% and the total number of households with IUEC smaller than 60% of the median decreases by almost one million.In fact, incorporation of IMRENT creates changes in two directions: some households move from being poor when we do not consider this variable to being over the poverty line when we include it, and visa versa. Table2 summarizes those changes.Table 2
Change in the number of households in poverty changes due to the inclusion of IMRENT.
With IMRENTPoorNo poorWithout IMRENTPoor2,036,696 (12.8%)1,152,926 (7.2%)No poor186,304 (1.2%)12,597,519 (78.9%)Source: drawn up by authors from INE (2007)  [3].More than one million Spanish households (1,152,926)rise above the poverty line when we include IMRENT in their Income per Unit of Equivalent Consumption, and only 186,304 drop below the poverty line. The incorporation of imputed rent significantly changes one’s estimate of the size of Spain’s poor population.The other question related to the measurement of poverty we mentioned in theIntroduction is the situation of people under the poverty line. Because that threshold changes when we introduce IMRENT, as we have seen in Tables 1 and 2, it is logical that the characteristics of Spanish poor households also change. Table 3 classifies the poor into four groups depending on poverty intensity: those close to poverty line—between 45% and 60% of the median—are the social precariousness, moderate poverty contains Spanish poor households with an Income per Unit of Equivalent Consumption between 44% and 30%, severe poverty includes those households with IUEC between 29 and 15%, and extreme povertytake into account of those with less than 15%.Table 3
Spanish poverty intensity depending on the inclusion or not of IMRENT.
% of the medianIUEC (€per year)NumberShare of spanish poorWithout IMRENTSocial precariousness (45–60%)5,355 to 7,1401,795,49556.3Moderate poverty (30–44%)3,570 to 5,354.90905,34528.4Severe poverty (29–15%)1,785 to 3,569.90349,96611.0Extreme poverty (Less than 15%)Less than 1,785138,8164.3With IMRENTSocial precariousness (45–60%)6,625.51 to 8,8341,421,31363.9Moderate poverty (30–44%)4,417.00 to 6,625.50569,55225.6Severe poverty (29–15%)2,208.50 to 4,416.90185,1278.3Extreme poverty (Less than 15%)Less than 2,208.5047,0082.1Source: drawn up by the authors.As we see in Table3, the inclusion of IMRENT not only reduces the number of Spanish poor, but also changes the distribution of that population. The share of people in extreme poverty decreases by more than two percentage points from 4.3% to 2.1% and the population close to the poverty line increases from 56.3% to 63.9%. These two results are very relevant: more than one-half of Spain’s poor are very close to the “threshold” of overcoming poverty with a relative small effort. On the other side, the introduction of IMRENT reduces to 47,000 the number of households that are far away from the poverty line.


## 3.2. Poverty Indexes by Autonomous Communities

We have thought that it should be interesting to briefly analyze the very heterogeneous situation of Spanish poverty depending on the Spanish Autonomous Community the household sited, since location will be a relevant variable in the estimation of next sections. Therefore, we have calculated the following indexes.(1)
Head count ratio(H): defined as the share of poor people (q,number of people under poverty line) in the population (n).(2)H=qn.
This is the principal measure used in poverty studies because of its simplicity. Nevertheless, it is not sensitive to the degree of poverty. In fact, it is independent of the poor distribution(2)
Income gap ratio (I), calculated as(3)I=∑i=1q(z-yi)qz=1-μpz,
where z is poverty line, y1…yq are households incomes per unit of equivalent consumption under the poverty line, and μp is the mean of those incomes. This index complements H. It is not sensitive to the share poor people represent in total population, just the contrary of H. (3)
Poverty gap ratio (HI):(4)HI=∑i=1q(z-yi)nz=qn-(∑i=1qyinz)=H(1-∑i=1qyinz)=HxI.Combination ofH and I, it takes into account at the same time the share of poor people in the population and the degree of poverty. It measures the necessary amount of income to position all the poor on poverty line, divided by the product of total population by the poverty line (nz). (4)
Percentage Contribution to Poverty(CPI), measured as(5)CPI=(niNIiI)×100,
where now N is Spanish population, ni are the inhabitants of the ith Spanish Autonomous Community, Ii is the income gap ratio for the same Community, and I is the Spanish income gap ratio. (5)
Relative Contribution to Poverty (CRI):(6)CRI=(IiI),
with Ii the income gap ratio in the ith Community and I the Spanish income gap ratio. If CRI is bigger than 1, then there is an overrepresentation of that CC.AA. in poor population, showing that the situation of that Community is worse than Spanish mean; on the contrary, if CRI is smaller than 1, then the Community is underrepresented and it is better off than the mean.(6)
Sen index(S):(7)S=H[I+(1-I)G],
a combination of Head Count Ratio (H), Income Gap Ratio (I), and Gini’s coefficient (G).Sen [5] was looking for a poverty index observing three axioms: (a) it only depends on poor households’ incomes, meaning that the income of nonpoor people and its changes do not affect the index; (b) it increases when the poor’s income decreases; and (c) it is sensitive to changes in poor people’s distribution. H and I satisfy the first axiom; I satisfy the second one but not H; and neither I nor H satisfies the third. On the contrary, a measure of inequality, Gini’s coefficient, satisfies all of them. Therefore, Sen Index includes information about the poor, poverty intensity, and a measure of inequality between poor households, since Gini’s coefficient is worked out taking only into account people under poverty line.  (7)
The family ofFoster, GreenandThorbecke  Indexes(FGT):(8)FGTα(y;z)=1n∑i=1q(z-yiz)α-1α>0.
These indexes consider the relative importance of income distance to poverty line. They weight poverty deficits. Those weights depend on the household’s income distance to poverty line. α is known as poverty aversion parameterand the bigger this parameter more relevance is attributed to poorest families.Ifα=1, the FGT index is identical to H;Ifα=2, it is HI;Ifα=3, the expression is(9)FGTα=3(y;z)=1n∑i=1q(z-yiz)2=H[I2+(1-I)2CV2],
with CV being the poor’s variation coefficient.Finally, ifα=4, the correspondent index is(10)FGTα=4(y;z)=1n∑i=1q(z-yiz)3.
It is employed when the researcher wants to emphasize the relevance of the poorest.(8)
Hagenaarsindex (HAG):(11)HAG(y,z)=qn[log⁡z-log⁡μlog⁡z].μ is the geometric mean of income per unit of equivalent consumption. This index considers information about the share of poor on total population along with an aggregated measure of poverty degree. The value of the index rises with poor people’s income distance to poverty threshold (there is a positive relationship between index value and the distance).The results are included in Tables4 and 5.Table 4
Poverty indexes by autonomous community (I).
(*)Without IMRENTWith IMRENTHIH*ICPICRIHIH*ICPICRIAndalucía0,2850,2740,07816,771,0040,1980,2250,04516,390,981Aragón0,1480,2660,0392,880,9730,1030,2310,0242,971,007Asturias0,1540,2340,0362,180,8580,1110,1900,0212,110,828Canary Islands0,2720,3050,0834,821,1180,2290,2190,0504,120,955Castilla-La Mancha0,3230,2580,0843,960,9460,2360,2100,0503,840,918Castilla and León0,2550,2820,0726,091,0320,1780,2390,0436,171,044Catalonia0,1340,2660,03615,990,9740,0950,2380,02317,081,040C.A. Ceuta and Melilla0,2510,4100,1030,401,5020,2370,3440,0810,391,501Madrid0,1200,2660,03213,140,9730,0670,2810,01916,561,226C. Valenciana0,1780,2640,04710,770,9650,1180,1970,0239,570,858Extremadura0,4030,2800,1132,421,0260,3620,2240,0812,310,978Galicia0,2240,2830,0636,241,0360,1530,2410,0376,331,052Balearic Islands0,1590,2770,0442,461,0150,0960,2540,0242,691,107La Rioja0,1900,2570,0490,680,9410,1540,1840,0280,580,803Navarre0,0760,1830,0140,930,6700,0490,1750,0091,060,764Basque Country0,1270,2880,0375,261,0560,0770,2170,0174,720,948Murcia0,2590,2840,0743,011,0400,1650,2770,0463,501,209TOTAL0,2000,2730,055100,001,0000,1390,2290,032100,001,000Source: drawn up by authors from LCS (2007).Table 5
Poverty indexes by autonomous community (II).
(*)Without IMRENTWith IMRENTGSFGT3FGT4HAGGSFGT3FGT4HAGAndalucía0,1720,1140,0350,0200,0130,1270,0640,0160,0080,006Aragón0,1890,0600,0180,0110,0070,1180,0330,0090,0040,003Asturias0,1410,0530,0140,0070,0050,1260,0320,0070,0040,003Canary Islands0,1770,1160,0380,0220,0150,1310,0740,0200,0110,009Cantabria0,1370,0490,0120,0060,0050,1640,0290,0060,0030,002Castilla-La Mancha0,1400,1170,0320,0150,0120,1160,0710,0170,0070,007Castilla and León0,1790,1050,0340,0210,0120,1390,0610,0180,0100,007Catalonia0,1600,0510,0160,0090,0060,1580,0340,0100,0050,003C.A. Ceuta and Melilla0,2690,1430,0590,0390,0200,2230,1160,0450,0290,014Madrid0,1660,0460,0150,0080,0050,1840,0270,0090,0050,003C. Valenciana0,1690,0690,0220,0130,0080,1250,0350,0080,0040,003Extremadura0,1450,1550,0470,0250,0180,1260,1170,0300,0140,011Galicia0,1700,0910,0290,0160,0100,1420,0530,0150,0070,005Balearic Islands0,1860,0650,0220,0140,0080,1130,0320,0090,0050,004La Rioja0,1510,0700,0200,0110,0080,1230,0440,0100,0050,004Navarre0,1340,0220,0060,0040,0030,1120,0130,0030,0020,001Basque Country0,2130,0560,0190,0120,0070,1290,0250,0060,0030,002Murcia0,1780,1070,0350,0210,0130,1500,0640,0200,0120,007TOTAL0,1720,0790,0250,0140,0090,1400,0470,0130,0060,005Source: drawn up by authors from LCS (2007).


## 4. The Proposed Model

As we have observed in previous sections, the introduction of IMRENT alters the estimated size of Spain’s poor population and poverty intensity. This leads to two questions:(i)
what characteristics define Spanish poor households and do they change when we introduce IMRENT?(ii)
what households’ features can explain the intensity of Spanish poverty? and again, do the features change with the inclusion of IMRENT?In order to answer those questions and assess the determinants of being under the poverty line and poverty intensity, we propose a Heckman model. It jointly estimates two equations: a selection equation in which the dependent variable is the probability of being under the poverty line—question one—and a truncated regression where explained variable is the distance from the household’s IUEC to poverty line—question two. Explanatory variables are the household’s characteristics.The independent variables included in the study are the following: (A descriptive analysis of Spanish poor depending on IMRENT and household’s characteristics can be found in Calvo and Sánchez [2].) (i)
Location characteristics. We incorporate a dummy variable for each Spanish Autonomous Community (17). We also include three dummy variables depending on the size of the town in which the household resides: densely, (Population density larger than 500 inhabitants per Km2 and total population bigger than 50.000 inhabitants.) medium ( Population density larger than 100 inhabitants per Km2 and total population smaller than 50.000 inhabitants. This is the reference group variable.), and sparsely populated areas.(ii)
Socioeconomic characteristics, including the following.
(a)
Number of household members.(b)
Type of household. Here we introduce 9 dummy variables depending on household composition: a man living alone less than 30 years old, (The variable takes value 1 if the household is composed by a man living alone less than 30 years old and 0 otherwise. The same definition applies to the rest of the variables. The reference group was households composed by a man or a woman 30 to 64 years old or two adults younger than 65 with no children.) a woman living alone less than 30 years old, a man or a woman living alone between 30 to 64 years old, a man living alone older than 65, a woman living alone older than 65, an adult with at least a dependent child, two adults with no children, at least one of them older than 65 years, two adults without children younger than 64, and two adults with dependent children.(c)
Household economic activity situation. We define four dummy variables: all members of the household nonworking, (We consider nonworking people those out of the labor market (retired, invalidity…). Therefore, this classification is different from unemployed.) all of them working, some working and some unemployed, (Control group.) and all household members unemployed.(d)
System of house tenancy. Four dummy variables: complete ownership, (It takes value 1 if the household owns the house and it is completely paid and 0 otherwise. On the contrary, mortgage dummy variable takes value 1 if the household owns the house but it has to pay a mortgage.) if the house owner is paying a mortgage, if the house is rented at a market price (Control group), and other types of rent. (It includes two cases: free of charge or with a rent smaller than the market price.)The dependent variables, as we have said, are two: for the selection equation we include a dummy taking value 1 if the household is under poverty line and 0 otherwise, and for the truncated regression, the variable is the difference between household’s IUEC and the poverty line (In the case of the estimation without IMRENT the calculus isVAR2=7,140-IUECi where i denotes the household. For the other case, with IMRENT, the variable is calculated as VAR3=8,834-IUECi.).


## 5. Estimation Results

Table6 summarizes the results for the estimates with and without IMRENT.  We employ the same variables for both equations.Table 6
Estimation results for Heckman’s model.
VariableWithout IMRENTWith IMRENTSignSelection equationNumber of members.0395(79.13).1567(294.62)(+)Cantabria-.1850(48.82)-.2409(56.81)(-)Basque Country-.2554(120.74)-.2089(87.24)(-)Navarre-.6135(139.49)-.6333(125.83)(-)Madrid-.2631(169.94)-.4198(228.99)(-)Catalonia-.2224(159.27)-.2376(152.12)(-)Aragón-.2886(111.52)-.2576(90.66)(-)Asturias-.2415(89.42)-.1821(61.22)(-)Balearic Islands-.1768(64.57)-.3566(112.96)(-)Extremadura.4146(169.17).4761(190.61)(+)Castilla and León.1034(58.90).1149(60.32)(+)Castilla-La Mancha.3156(159.68).2467(117.72)(+)Andalucía.2415(192.13).1760(127.79)(+)Canary Islands.2800(143.58).3042(147.75)(+)Murcia.1367(58.71).0132(5.11)(+)Ceuta and Melilla.1325(18.34).2371(31.36)(+)Densely populated-.0972(88.60)-.0581(47.18)(-)Sparsely populated.1609(140.37).3288(262.58)(+)All nonworking.6381(343.51).4714(236.83)(+)All working-.1082(72.86)-.1160(74.98)(-)All unemployed.9524(389.43).8409(333.21)(+)Man younger than 30-.2491(52.00)-.3051(56.06)(-)Man older than 65.2749(100.19)−.3210(88.03)(+)/(−)Woman younger than 30.7842(134.80).6668(105.91)(+)Woman older than 65.6364(344.16)−.1534(66.19)(+)/(−)2 adults one of them older than 65.0578(39.42).1644(100.74)(+)2 adults with children.3733(313.48).3034(242.23)(+)1 adult with 1 child.5217(177.81).6217(204.75)(+)House ownership-.2327(155.05)-.9925(695.55)(-)House with mortgage-.5052(312.98)-1.2454(806.08)(-)Other type of rented house.0836(47.09)−.6043(347.93)(+)/(−)Constant-1.094(406.68)-.9215(334.82)(-)TruncatedregressionNumber of members78.62(71.95)146.18(109.82)(+)Cantabria-248.69(27.60)—(-)/Basque Country133.06(25.46)398.96(55.64)(+)Navarre−501.97(41.78)99.20(6.26)(−)/(+)Madrid−49.01(13.02)653.82(124.04)(−)/(+)Catalonia−.37.67(11.39)285.38(66.05)(−)/(+)Aragón135.60(22.13)436.24(54.88)(+)Asturias-185.33(29.12)-40.17(4.90)(+)/Balearic Islands—347.56(38.62)(+)Extremadura49.64(10.33)−242.30(42.43)(+)/(−)Castilla and León160.36(42.65)340.25(68.19)(+)Castilla-La Mancha-42.02(10.21)-157.18(30.15)(-)Andalucía-47.81(17.22)-52.82(14.76)(-)Canary Islands139.67(33.41)-232.03(45.42)(-)Murcia109.33(22.46)429.94(64.58)(+)Ceuta and Melilla724.58(48.74)585.40(34.01)(+)Densely populated-84.95(34.13)-122.72(36.47)(-)Sparsely populated-43.30(16.87)-144.08(42.46)(-)All nonworking-319.65(64.30)-288.04(55.97)(-)All working−214.82(60.31)30.94(7.64)(−)/(+)All unemployed325.87(54.72)145.41(24.77)(+)Man younger than 301373.67(106.76)1473.70(91.70)(+)Man older than 65−827.46(153.48)92.70(8.89)(−)/(+)Woman younger than 301278.79(107.36)1197.24(79.77)(+)Woman older than 65-762.28(176.80)-251.12(40.51)(-)2 adults one of them older than 65-339.96(106.59)-548.93(130.16)(-)2 adults with children-286.29(89.77)-349.29(104.01)(-)1 adult 1 child796.88(126.74)117.28(16.70)(+)House ownership-54.00(23.30)-229.57(80.61)(-)House with mortgage——Other type of rented house126.81(38.88)−22.01(6.23)(+)/(−)Constant2334.06(201.97)3298.26(360.24)(+)Wald testχ2 (29)333865.82228470.60athrho-.0176(4.97)−5890(314.31)lnsigma7.3121(18326.31)7.4878(9054.02)Wald test of independent equations (rho=0) χ2 (1) =23.9176741.79T-ratios within parenthesis. All the estimates are significant at 99%.Table 7
Main results of Spanish poverty studies.
AuthorData baseSubject of the studyVariablePoverty lineResults/povertyPlan CCB [1].Secondary data bases.To know the extent of poverty in Spain. They consider absolute poverty.People with less than 2,100 kal. Per day.People without a house.People perceiving Social AidAbsolute poverty line: combination of different variables.Families in poverty:  3 million.FOESSA [7]Family Survey 1963.Secondary data bases.To know the extent of poverty in Spanish households.Income per household.Less than 2,500 ptas./month per family.1,630,00 households. 7 million people.INE [8].Survey on Family Budgets (From now on EPF) 1980/81First estimation of poverty coming from the EPF.Income per household.n.d.21.8% households.19.2% people.EDIS [9].National Survey 1983.Analysis of poverty and social alienation in Spain.Income per head.50% of monthly income (mean).12,50018% urban zones.24% in towns with less than 250,000 h. total: 8 millions.Ministerio de Trabajo [10]National Survey 1983-84.Verify the extent of Spanish poverty. It includes criteria of subjective and objective poverty.Income per head.50% of monthly income  (mean).17,488 ptas/month.16.7 households.22.7% people.Ruiz-Castillo [11].EPF1980/81It applies different sensibility indicators to the microdata.Expenditure per head.50% of expenditure per head.110,188 ptas./year.14.4% households.17.0% people.Bosch et al. [12].EPF 1973/74 and 1980/81Evolution of Spanish poverty in the seventies applying Ruiz-Castillo methodology.Expenditure per head.50% of expenditure per head.1973=17.9% people. 1980=16.8% people.Ohiggins and Jenkins [13].EPF 1973/74 and 1980/81.Continuous Survey on Family Budgets (From now on ECPF) (ECPF) 1985.International comparisons of poverty evolution.Income per head.50% of income per head.1973Households=20.5%; People=20.0%.1980 Households=19.5%; People=20.5%.1985 Households=20.0%; People=20.0%.ECB-Equipo de Economía Cuantitativa del Bienestar de la Universidad de Málaga [14].Survey on Family Budgets  1980/81 (EPF).Geographical distribution of poverty.Income per household.50% of income per household.Province analysis:Álava (7.4%), Guipúzcoa (7.7)   and   Vizcaya   (9.6%).Cáceres (49%), Zamora (44%) and Badajoz (44%).Escribano [15].EPF 1973/74 and 1980/81. ECPF 1985, 86, 87 and 88.Evolution of poverty and inequality.Expenditure per head.50% expenditure per head.16.0% people.EUROSTAT [16].ECPF1987International poverty comparison and sensibility analysis.Expenditure per equivalent adult.50% mean of expenditure per equivalent adult.16.9% people.17.5% households.INE [17].EPF 1990/91Study of less fortunate  households.Mean of equivalent expenditure.50% mean of equivalent expenditure:426,320 ptas/year.18.9% people.19.7% households.Ayala et al. [18].EPF 1980/81 and 19990/91.Luxemburg Income Study.International poverty comparisons with homogeneous dataExpenditure per equivalent adult Income per equivalent adult198050% expenditure per equivalent adult: 141.720 ptas/year. 50% income per equivalent adult: 119.523 ptas/year.199050% expenditure per equivalent adult: 427.315 ptas/year.(a) Expenditure:  1980: households = 19.7%; people = 19.6%.1990: households = 18.6%; people = 17.6%. (b)  Income: 1980: households = 16.2%; people = 18.4%.1990: households  = 13.0%; people = 15.1%.García Linaza and Martín Reyes [19].EPF 1980/81 and 1990/91.Geographical distribution of poverty.Household income (national mean).50% national mean of household income: 555,092 ptas/year.Province analysis:Álava (6.8%), Madrid (8.9), Navarra (10.3) and Vizcaya (11.9%).Salamanca (40.4%), Badajoz (39.4), Ávila (38.6) and Cáceres (34%).FOESSA [20]National Survey 1993.Extent and composition of poverty distinguishing different levels.Income per equivalent adult.50% Income per equivalent adult:453,504 ptas/year.(a) People:  (U: 25%) = 3.64%.(U: 50%) = 20.16%.(b) Families: (U: 25%) = 2.26%.(U: 50%) = 16.44%Ruiz-Huerta and Martínez [21]EPF 1980/81 and 1990/91.Exhaustive analysis of Spanish poverty patterns. Relationships between poverty and house equipment.Expenditure per equivalent adult Income per equivalent adult.50% equivalent expenditure.   415,935 ptas/year. 50% equivalent income: 349,575 ptas/year.(a) Expenditure (people): 1980: (U: 25%) = 3.5%; (U: 50%) = 19.6%.1990: (U: 25%) = 2.3%; (U: 50%) = 17.9%. b) Income (people): 1980: (U: 25%) = 3.3%; (U: 50%) = 18.4%. 1990: (U: 25%) = 2.3%; (U: 50%) = 15.0%.Martín Guzmán [22].EPF 1973/74, 1980/81 and 1990/91Poverty evolution from 1973 to 1990.Expenditure per head. Income per head.25 and 50% of expenditure per head. 25 and 50% income per head.Expenditure:EPF 73/74: 25% = 3.1; 50% = 22.0.    EPF 80/81:  25% = 2.9; 50% = 20.6.    EPF90/91: 25% = 2.1; 50% = 19.0.FOESSA [23]Survey.EDIS-FOESSA. 1994–1996Study about the extent and composition of Spanish poverty distinguishing  different levels.Expenditure per equivalent adult. Income per equivalent adult.50% net disposable income.19.4% households. 22.1% people: 8,509,000Poza Lara (mimeo) [24]Households European Panel (From now on PHOGUE) (1996–2001)Levels and evolution of relative poverty. Differentiation by socioeconomics characteristics.Net equivalent income.50% median.Poverty rate (2001) = 17%.Increase of poverty from 1996 to 1999 and decrease until 2001. From 1996 to 2001 invariable. The worst situation: unemployed; without studies; couples without children;  people with less than 16 years and older than 65; women.Pérez Mayo et al. [25]PHOGUEPrivation indicator and analysis of heterogeneous population.Different variables: lack of goods and services related to household necessities and economic capabilities.Poverty line elaborated by a model of latent classes: three population groups.17.5%.Most Spanish families can afford food and clothing necessities.Martínez and Ruiz Huerta [26]PHOGUEComparison between monetary and nonmonetary poverty. Multidimensional privation indicator.Different variables: presence or lack of goods and services related to the household and economic capabilities.Generated by data. Nontraditional weights.Correlation between monetary poverty and multidimensional privation indicator but not significant. Population has a no homogeneous behavior.Oliver et al. [27]ECPFIncome distribution from 1985 to1996.Real net equivalent income.Deciles of distribution.Improvement of the concentration of income in favor of the poorest. Decrease of inequality especially from 1985 to 1989.Adiego Estrella and Moneo Ocaña [28]PHOGUEEvolution of poverty and persistent poverty differentiating by population segments.Income per unity of equivalent consumption.60% income median. Multidimensional privation of living conditions.1994 = 19.6%.2001 = 18.8%.The worst situation (poverty and persistent poverty): women, without studies; unemployed; 2 adults without children.Ayala and Navarro  [29]PHOGUEEvaluate household welfare from housing point of view.Variables related with household equipment and living conditions.Nonarbitrary differentiation by groups: Latent classes’ model.Probability of lack of basic equipment = 16%.The worst situation: CC.AA.: Northwest zone, Center, South and  Canary Islands.Characteristics: low income level; unemployed; no house on property; over 65 years; low studies level; bad health situation; woman.Ayala and Navarro [29]PHOGUEDefinition of a multidimensional privation index based on household elements. They obtain transversal poverty levels depending on socioeconomic characteristics.Household elements and conditions.Nonarbitrary differentiation by groups: Latent classes’ model.Probability of suffering privation basic problems = 16%.Different privation behavior depending on region and population characteristics.Ayala et al. [30]PHOGUERelationship between monetary poverty and privation focused in Spanish Autonomous Communities (CC.AA).Presence or lack of some goods and services.Nonarbitrary differentiation by groups: Latent classes’ model.Global privation = 16.8%.Monetary poverty = 18.8%.CC.AA. with the worst situation (privation): Canary Islands, Extremadura, Andalucía, Murcia, Galicia, Cantabria and Asturias.Ayala et al. [31]PHOGUERelationship between monetary poverty and social privation.Basic necessities, house conditions and secondary necessities.Nonarbitrary differentiation by groups: Latent classes’ model.Global privation = 7,7%.CC.AA. situation: similar to the preceding study.Jurado and Pérez Mayo [32]ECPF e INEMProxy to a multidimensional welfare index by r CC.AA.Adjusted consumption, real wealth, equity and economic security by inhabitant.Uniform group differentiation (arbitrary) by factorial analysis.The most favored CC.AA: Navarra, Vasque Country, Catalonia and Madrid.The less favored CC.AA. Extremadura, Andalucía and Canary Islands.Poza Lara [33]Technique of data reductionPHOGUE 1994–2000To create a multidimensional model to explain poverty. To elaborate an indirect index of personal poverty (factorial analysis).It includes seven variables: three objective and four subjective variables.Limits, ranks, and scales to inform individual situation.Poverty is a multidimensional concept.Gender inequality.Immigrants are in a worsen situation than nationals.Calvo et al. [6]Statistics on Income and Living Conditions 2005 (ECV)FOESSA 1998To compare the situation of Spanish poverty in 1996 and 2004. To analyze the changes in poverty patterns.Income per unit of equivalent consumption.50% of income per unit of equivalent consumption.2, 912,031 households (19.2%).7, 772,678 people (18.1%).Calvo et al. [34]Statistics on Income and Living Conditions 2005 (ECV)To obtain a multidimensional index to analyze the behavior of Spanish Autonomous Communities.Income per unit of equivalent consumption.60% of median of income per unit of equivalent consumption (6,292.80€).20.3% (3 millions) households are under poverty line.Sánchez [4]Statistics on Income and Living Conditions 2007To study  household and individual characteristics of Spanish poorIncome per unit of equivalent consumption/personal income  with and without Imputed Rent.60% of median. Households: 7.140€/year without IMRENT and 8,834 with it.Individuals: 6,923€/year without and 8,103 with it.Households: 20% (3,189,662) without IMRENT and 14% (2,223,001) with it.Individuals: 24.4% (7,070,572) without IMRENT and 19.6% (5,708,155) with it.Calvo and Sánchez [2]Statistics on Income and Living Conditions 2007 (ECV)To compare the characteristics of Spanish poor with and without Imputed Rent (IMRENT)Income per unit of equivalent consumption60% of median of income per unit of equivalent consumption: 7,140€/year without IMRENT 8,834€/year with IMRENT20% (3,189,622) without IMRENT14% (2,223,001) with IMRENTChanges in the distribution: a big share of widows and retired people leave poverty if IMRENT is included.Calvo and Sánchez [2].The first result we can observe in Table6 is the interrelationship between the selection equation and the outcome equation given the Wald test rejection of the independence between of the two equations. Second, most of the signs on the coefficients are unaffected by the inclusion of IMRENT. The probability of being poor increases with the number of household members; for families living in Extremadura, Castilla and León, Castilla-La Mancha Andalucía, Canary Islands, Murcia and Ceuta and Melilla, or in a sparsely populated areas; for households with all its members unemployed or not working; for women younger than 30 living alone; for households with two adults with children or 1 adult and 1 child.  On the other hand, the probability of being under the poverty line decreases for households in Cantabria, the Basque Country, Navarre, Madrid, Catalonia, Aragón, Balearic Islands, or Asturias; households in densely populated cities; households in which members have jobs;  and for households with homeowners, with or without a mortgage.In the truncated regression, the intensity of poverty (measured by the distance between the poverty line and household income per unit of equivalent consumption) increases with the number of household members; is higher for households in the Basque Country, Aragón, Balearic Islands, Castilla and León, Murcia, Ceuta and Melilla; higher for households with all its members unemployed; higher for men and women younger than 30 and for adults with children. On the other side, intensity of poverty is moderated for households in Asturias, Castilla-La Mancha, Andalucía, Canary Islands; households living in a densely or sparsely populated area; with all its members not working; with a woman older than 65, two adults one of them older than 65, or two adults with children and home ownership.The introduction of IMRENT changes the signs of several variables. Households comprised of a man or a woman older than 65 living alone increases the probability of being under the poverty line if we do not take into accountImputed Rent, but decreases the probability of poverty if we include it. The same happens with the variable “other type of rented houses”. In the case of poverty intensity the effect of some Autonomous Communities change their sign, moving from a negative effect to a positive one. This is the case with Navarre, Madrid, and  Catalonia. The same pattern follows for the effects of belonging to a household with all its members employed and living alone and being more than 65 years old. The sign changes from positive to negative for households in Extremadura and for other types of rented houses.


## 6. Conclusions

The main criticism of Spanish poverty studies is the household income calculation. Until 2007, the Spanish Statistics on Income and Living Conditions did not include estimates of house property income (IMRENT) and because more than 80% of Spanish families are homeowners, its exclusion likely biases the results. In 2007, the Spanish National Institute of Statistics modified the methodological approach to the SILC and included an estimate ofImputed Rent.As we have demonstrated, the introduction of IMRENT alters estimate of the size of Spain’s poor population and poverty intensity. We have set out two questions related to the introduction ofImputed Rent: does the introduction or IMRENT change the characteristics that determine the probability of being poor? Does the introduction of IMRENT change the household attributes that explain the intensity of poverty in Spain?In order to answer those questions we proposed a Heckman model. It jointly estimates two equations: a selection equation in which the dependent variable is the probability of being under the poverty line, and a truncated regression where the explained variable is the distance from household’s IUEC to poverty line.The results show that the Heckman model is a good approach because both equations are interrelated. At the same time, we also observe that some characteristics change when we introduce IMRENT, especially those related to Autonomous Communities and the size of the community in which the household is located. But perhaps one of the most important differences is related to age: if we do not considerImputed Rent, the probability of being under the poverty line increases with age, and most retired people and widows—those being more than 65 years old—can be classified as poor. On the other hand, if we do we take IMRENT into account, living alone and being elderly decrease the probability of being poor.


## 7. Policy Implications of the Study

Our findings have at least two economic policy implications: one is related to location heterogeneity and the second one concerns aged people.Spanish social policy against poverty should take into account geographical differences but, at the same time, should consider imputed rent. Without this last variable, efforts should concentrate in Spanish less developed regions and rural areas. But if we include it, poverty increases in urban population. Therefore, new poverty studies should be developed taking into consideration regional heterogeneity and imputed rent in order to define poverty fight policy.The paper has also revealed that most retired people cannot be considered poor if we take into account wealth (imputed rent included) instead of current income (pension). This has some implications in social policy.Spain is confronting the challenges associated with financing its Public Pensions’ System since its situation is not sustainable in the future. Spanish pensions’ system is contributive, so people who are working today pay the pensions of retirees with their contributions to the Social Security System. At the same time, social policy applied for successive governments has supported the idea of guaranteeing retired people living conditions with their pensions.This system works when occupied people are more than retired ones. But with an unemployment rate of 20 percent and more than 8 million retirees, the situation is unbearable. It is not possible to finance too many people living too long—most people live more than 20 years after retirement age—in the actual crisis and in the future.The article proposes a line of study: taking into account not only current income but wealth (Imputed Rent) when assessing the adequacy of retirement pensions. This policy orientation must, however, be cognizant of changes in the Spanish property market and the ability of retirees to monetarize those assets.



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*Source: 854634-2010-12-14.xml*