the impact of food and economic crises on diet and nutrition the conventional view is that inelastic demand makes consumption of staple foods resilient to major price and income shocks we explore the dietary and nutritional implications of a major shock in bulgaria in the mid 1990s with data from before during and after the shock while demand for foodstuffs may remain relatively unchanging in environments characterised by stable food prices and incomes economic crises and significant price spikes appeared to induce dramatic changes in price and income demand elasticities we therefore suggest the use of caution in basing policy prescriptions on randomly available pre crisis simulations

quantity aggregation in consumer demand analysis when physical quantities are observed a method for estimating price and income elasticities from cross section data devised by deaton 1986 1987 1988 makes implicit use of the hicks composite commodity theorem recognition of this fact allows theoretically rigorous definition of aggregate composite quantities a comparison of elasticities of hicks composite with elasticities of simple physical quantity measures for the ivory coast and the united states demonstrates that use of physical quantity measures can be severely misleading when commodity heterogeneity is substantial copyright 1990 by mit press

50th anniversary article option pricing valuation models and applications this paper surveys the literature on option pricing from its origins to the present an extensive review of valuation methods for european and american style claims is provided applications to complex securities and numerical methods are surveyed emphasis is placed on recent trends and developments in methodology and modeling

a composite leading indicator of the inflation cycle for the euro area we evaluate the performance of composite leading indicators of turning points of inflation in the euro area constructed by combining the techniques of fourier analysis and kalman filters with the national bureau of economic research methodology in addition the study compares the empirical performance of euro simple sum and divisia monetary aggregates and provides a tentative answer to the issue of whether or not the uk should join the euro area our findings suggest that first the cyclical pattern of the different composite leading indicators very closely reflect that of the inflation cycle for the euro area second the empirical performance of the euro divisia is better than its simple sum counterpart and third the uk is better out of the euro area 2005 taylor francis group ltd

quality quantity and nutritional impacts of rice price changes in vietnam summary asian governments intervene in the world rice market to protect domestic consumers whether consumers are nutritionally vulnerable depends on the elasticity of calories with respect to rice prices common demand models applied to household survey and market price data ignore quality substitution and force all adjustment onto the quantity calorie margin this paper uses data from vietnam on market prices food quantity and quality a 10 increase in the relative price of rice reduces household calorie consumption by less than 2 but this elasticity would be wrongly estimated to be more than twice as large if quality substitution is ignored

the changing empirical definition of money some estimates from a model of the demand for money substitutes interest bearing checkable deposits are examined to test whether they should be included in measures of the u s money stock both divisia and traditional simple sum aggregates are constructed on the basis of tests for weak separability in a model of the demand for financial assets using nonparametric demand analysis we find that several groups of assets are compatible with aggregation theory we find empirical support for a narrow measure consisting of the components of current mia in tests based on a st louis equation and in terms of controllability a divisia aggregate performs better than the simple sum mia measure

do the urban poor face higher food prices evidence from vietnam abstract whether there is a poverty penalty in terms of food prices is unsettled in the literature after more than four decades of study unit values from household surveys suggest that prices vary with income while outlet surveys typically find food prices varying with store type but not with neighborhood income most outlet surveys are from rich countries with just one spatially limited study from a developing country in this paper we use especially collected food price data from metropolitan areas of vietnam to test whether the urban poor face higher food prices food prices in low income neighborhoods are 1 lower on average than in other neighborhoods unit values give a different answer to the question of whether the poor face higher prices and are not suited to answer such a question

prepayment and the valuation of mortgage backed securities this paper puts forward a valuation framework for mortgage backed securities rather than imposing an optimal value minimizing call condition we assume that at each point in time there exists a probability of prepaying this conditional probability depends upon the prevailing state of the economy to implement our valuation procedure we use maximum likelihood techniques to estimate a prepayment function in light of recent aggregate gnma prepayment experience by integrating this empirical prepayment function into our valuation framework we provide a complete model to value mortgagebacked securities given an optimal value minimizing call policy a mortgage should never be called when its market value is less than its call price similarly a mortgage should be called if it is worth more than its call price however mortgagors often call their loans when the prevailing refinancing rate exceeds the contract rate on the loan dunn and mcconnell 1981 in addition some mortgagors do not call their loans when the loan s contract rate exceeds the prevailing refinancing rate the purpose of this paper is to put forward a valuation framework for mortgagebacked securities consistent with these stylized facts associated with mortgage prepayments the mortgagor s prepayment decision is integral to our valuation framework however we do not impose an optimal value minimizing call condition to price these securities rather we assume that at each point in time there exists a probability of prepaying this conditional probability depending upon the prevailing state of the economy by integrating this prepayment function into our valuation framework we provide a complete model to value mortgage backed securities to implement our valuation procedures we estimate a prepayment function given recent gnma prepayment experience we follow green and shoven 1986 by using a proportional hazards model to estimate the influence of various explanatory variables or covariates on the mortgagor s prepayment decision distinct from green and shoven we explicitly model the effects of seasoning as well as investigating the influence of interest cost savings from refinancing in addition we also consider the effects of lagged refinancing rates heterogeneity

international income inequality measuring ppp bias by estimating engel curves for food there are large differences between rich and poor people in the world this is of major concern to economists as well as to policy makers the magnitude of the dif ferences however depends on the measure used for comparisons to illustrate per capita income in china is more than five times larger if one uses penn world table pwt 1 incomes rather than exchange rate based ex incomes in this paper we study pwt incomes which aim at correcting for price level dif ferences across countries and identify the bias in them by estimating engel curves for food furthermore we study the relationship between the bias and the income of a country the pwt produces purchasing power parity ppp adjusted incomes and thus the associated bias is referred to as the ppp bias having estimated the bias in pwt incomes we provide new estimates of real income and refer to these as the engel curve ec incomes by comparing the estimated ec incomes and the pwt incomes the issue of how the bias influences estimated inequality is discussed finally we discuss whether ex incomes which simply transform each country s nominal income into one common currency provide better estimates of income than do pwt incomes this paper reports three main findings first there is substantial and systematic ppp bias in the pwt incomes the poorer the country the more its income tends to be overestimated 2 second the ppp bias causes a substantial and robust underesti mation of international inequality the gini index increases substantially when one adjusts for the bias third whereas pwt incomes provide better estimates than the ex incomes for the richer countries the ex incomes which implicitly assume that ppp holds provide better estimates for the poorer countries as we know that price levels differ across countries there is consensus that the seminal work on establishing the pwt was a well founded initiative and the data have been extensively used 3 still although many studies rely on pwt data few focus on the ppp bias in this dataset some contributors focus on one component of the bias however the so called substitution bias and use macro data to measure this

an equilibrium model of bond pricing and a test of market efficiency in two previous and related papers 3 4 the authors have reported the results of estimating a particular equilibrium model of bond pricing using quarterly data on canadian government bonds for the period 1964 to 1979 this paper reports the results of applying a similar model to the pricing of u s government bonds for the period 1958 1979 using data from the crsp government bond file the paper also extends the previous empirical analysis by evaluating the ability of the pricing model to detect underpriced and overpriced bonds the data reveal a strong relation between price prediction errors and subsequent bond returns

an admissible monetary aggregate for the united kingdom this paper evaluates the performance of a monetary aggregate that is constructed from principles of economic and index number theory results from tests for weak separability indicate that wholesale deposits should not be aggregated with other u k financial assets they currently are included however in broad monetary aggregates published by the bank of england financial asset groupings passing the weak separability tests then were aggregated using both simple sum and divisia weights in each case the divisia aggregates were more closely related to the growth of nominal gdp and had stable demand for money functions copyright 1991 by mit press

quality quantity and spatial variation of price this paper develops and implements a method for estimating price elasticities of demand using cross sectional household survey data geographically clustered households report unit values which when corrected for quality effects and for measurement error indicate the underlying spatial variation in prices and can be matched to variation in demand patterns a simple model of quality choice is proposed while the correction for measurement error exploits the clustered design of such surveys data from a 1979 household survey from the ivory coast are used to estimate price elasticities for beef meat fish cereals and starches copyright 1988 by american economic association

the price effects of cash versus in kind transfers this article examines the effect of cash versus in kind transfers on local prices both types of transfers increase the demand for normal goods in kind transfers also increase supply in recipient communities which could lead to lower prices than under cash transfers we test and confirm this prediction using a programme in mexico that randomly assigned villages to receive boxes of food trucked into the village equivalently valued cash transfers or no transfers we find that prices are significantly lower under in kind transfers compared to cash transfers relative to the control group in kind transfers cause a 4 fall in prices while cash transfers cause a positive but negligible increase in prices in the more economically developed villages in the sample households purchasing power is only modestly affected by these price effects in the less developed villages the price effects are much larger in magnitude which we show is due to these villages being less tied to the outside economy and having less competition among local suppliers

using semiparametric models to study nutrition improvement and dietary change with different indices the case of china in company with rapid economic growth chinese consumers have seen a remarkable nutrition improvement and a dramatic dietary change this article investigates the driving forces behind these changes with use of the china health and nutrition survey chns data this paper first proposes 10 different indices to measure nutrition improvement and dietary change from different perspectives and then adopts semiparametric panel data models to capture the complicated nonlinear relationship between these nutrition indices and income growth while controlling for other variables parametrically this enables us to directly predict the nutrition improvement and dietary change at different income levels from different aspects this paper particularly finds that nutrition improvement and dietary change will continue in china but will slow down in the future with further income growth

divisia money in a composite leading indicator of inflation the principal objective of this paper is to compare the performance of the divisia m4 monetary index with the standard simple sum measure of broad money in the context of composite leading indicators of inflation in the united kingdom inflation targeting is an important component of current uk monetary policy and the construction of composite leading indicators of inflation is a potential advance over the current practice of monitoring a range of indicators of inflation the leading indicators proposed provide useful turning point information for inflation and advocate principal component analysis as a more sophisticated weighting mechanism for the constituent components indicators constructed using a divisia index measure of money were found to be more closely related to the inflation reference cycle than indicators using their simple sum counterparts when a principal components weighting mechanism was used

a comparison of linear forecasting models and neural networks an application to euro inflation and euro divisia linear models reach their limitations in applications with nonlinearities in the data in this paper new empirical evidence is provided on the relative euro inflation forecasting performance of linear and non linear models the well established and widely used univariate arima and multivariate var models are used as linear forecasting models whereas neural networks nn are used as non linear forecasting models it is endeavoured to keep the level of subjectivity in the nn building process to a minimum in an attempt to exploit the full potentials of the nn it is also investigated whether the historically poor performance of the theoretically superior measure of the monetary services flow divisia relative to the traditional simple sum measure could be attributed to a certain extent to the evaluation of these indices within a linear framework results obtained suggest that non linear models provide better within sample and out of sample forecasts and linear models are simply a subset of them the divisia index also outperforms the simple sum index when evaluated in a non linear framework 2005 taylor francis group ltd

monetary integration and currency substitution in the ems the case for a european monetary aggregate abstract this paper examines the phenomenon of cross currency substitution and the validity of monetary aggregation within the european monetary system using non parametric methods which exploit the relationship between intergroup substitution and separability the separability property is tested using the methodology developed by varian the nonparametric approach to demand analysis econometrica 50 945 974 1982 nonparametric tests of consumer behaviour review of economic studies 51 99 110 1983 and is violated in the case of most european countries suggesting that the hypothesis of zero currency substitution which forms the basis of national monetary aggregation should be rejected the results do however validate the use of monetary aggregates for the ems as a whole and i use a standard parametric demand for money approach to compare the performance of an ems divisia index with that of simple sum aggregates during the 1980s and 1990s

an intertemporal general equilibrium model of asset prices this paper develops a continuous time general equilibrium model of a simple but complete economy and uses it to examine the behavior of asset prices in this model asset prices and their stochastic properties are determined endogenously one principal result is a partial differential equation which asset prices must satisfy the solution of this equation gives the equilibrium price of any asset in terms of the underlying real variables in the economy in this paper we develop a general equilibrium asset pricing model for use in applied research an important feature of the model is its integration of real and financial markets among other things the model endogenously determines the stochastic process followed by the equilibrium price of any financial asset and shows how this process depends on the underlying real variables the model is fully consistent with rational expectations and maximizing behavior on the part of all agents our framework is general enough to include many of the fundamental forces affecting asset markets yet it is tractable enough to be specialized easily to produce specific testable results furthermore the model can be extended in a number of straightforward ways consequently it is well suited to a wide variety of applications for example in a companion paper cox ingersoll and ross 7 we use the model to develop a theory of the term structure of interest rates many studies have been concerned with various aspects of asset pricing under uncertainty the most relevant to our work are the important papers on intertemporal asset pricing by merton 19 and lucas 16 working in a continuous time framework merton derives a relationship among the equilibrium expected rates of return on assets he shows that when investment opportunities are changing randomly over time this relationship will include effects which have no analogue in a static one period model lucas considers an economy with homogeneous individuals and a single consumption good which is produced by a number of processes the random output of these processes is exogenously determined and perishable assets are defined as claims to all or a part of the output of a process and the equilibrium determines the asset prices our theory draws on some elements of both of these papers like merton we formulate our model in continuous time and make full use of the analytical tractability that this affords the economic structure of our model is somewhat similar to that of lucas however we include both endogenous production and

valuation and analysis of collateralized mortgage obligations this study develops a model for the valuation of collateralized mortgage obligations cmos the model is based on a two factor model of the term structure of interest rates and embeds an empirically estimated mortgage prepayment function the model is used to analyze various cmo tranches including standard sequential pay fixed rate tranches planned amortization class pac tranches targeted amortization class tac tranches floating rate tranches interest only io and principal only po tranches z bonds and residuals the results of this analysis illustrate the sensitivity of the various tranches to differences in cmo structure changes in interest rates the characteristics of the underlying collateral and mortgage prepayments

non parametric tests of consumer behaviour the neoclassical model of consumer behaviour postulates that a consumer s choice behaviour can be described as deriving from utility maximization subject to a budget constraint one is then naturally led to ask what this model implies about observed behaviour this question has been addressed from two quite distinct approaches the first approach originating in the work of slutsky 1915 and antonelli 1886 derives necessary and sufficient conditions involving the derivatives of the demand functions the second approach originating in the work of samuelson 1938 1947 1948 derives algebraic conditions on the demand functions implied by maximizing behaviour

company sector money demand new evidence on the existence of a stable long run relationship for the united kingdom the u k departure from the european exchange rate mechanism has created an urgent need for new indicators of monetary policy stance traditional simple sum monetary aggregates have proven unreliable particularly in the face of the financial innovations of the 1980s micro theory suggests that inappropriate aggregation over heterogeneous assets and holders may be to blame the present paper tests for weak separability of asset groupings for the u k company sector divisia weighted aggregates are constructed for the resulting narrow and broad groupings it is shown that stable long run relationships corresponding to money demand equations exist for these aggregates arbitrary dummies representing financial innovation are not required in contrast to some other work in this area copyright 1994 by ohio state university press

quadratic engel curves and consumer demand this paper presents a model of consumer demand that is consistent with the observed expenditure patterns of individual consumers in a long time series of expenditure surveys and is also able to provide a detailed welfare analysis of shifts in relative prices a nonparametric analysis of consumer expenditure patterns suggests that engel curves require quadratic terms in the logarithm of expenditure while popular models of demand such as the translog or the almost ideal demand systems do allow flexible price responses within a theoretically coherent structure they have expenditure share engel curves that are linear in the logarithm of total expenditure we derive the complete class of integrable quadratic logarithmic expenditure share systems a specification from this class is estimated on a large pooled data set of u k households models that fail to account for engel curvature are found ro generate important distortions in the patterns of welfare losses associated with a tax increase

admissible monetary aggregates for the euro area we use the fleissig and whitney fleissig a r whitney g a 2003 a new pc based test for varian s weak separability conditions journal of business and economics statistics 21 1 133 144 weak separability test to determine admissible levels of monetary aggregation for the euro area we find that the euro area monetary assets in m2 and m3 are weakly separable and construct admissible divisia monetary aggregates for these assets we show that real growth of the admissible divisia aggregates enters the euro area is curve positively and significantly for the period from 1980 to 2005 out of sample we show that divisia m2 and m3 appear to contain useful information for forecasting euro area inflation

rational prepayments and the valuation of collateralized mortgage obligations absteract this article presents a procedure for evaluating collateralized mortgage obligation cmo tranches the solution procedure is in the spirit of a dynamic programming problem in which an individual mortgagor s decision to prepay is the feedback control variable the mortgagor seeks to minimize the value of the mortgage subject to refinancing costs we employ a two step procedure to solve this dynamic programming problem the first step uses an implicit finite difference backward solution procedure to determine the optimal prepayment boundary for a class of mortgagors each of whom confronts the same proportional refinancing cost this step is repeated for several different classes of mortgagors that differ in the level of refinancing costs that they confront the outcome of this first step is a series of prepayment boundaries one set of boundaries for each level of refinancing costs i e one set of boundaries for each refinancing cost category of mortgagors in the second step the prepayment boundaries determined in the first step are used in conjunction with monte carlo simulation to value the cmo tranches the essence of the second step is that when the simulated interest rate hits the boundary for a particular class it triggers a prepayment scenario for that class of mortgagors we conduct extensive sensitivity analysis to determine the robustness of this approach and our solution procedure to alternative single factor models of the term structure of interest rates and to alternative specifications of the distribution of refinancing cost levels confronted by mortgagors the sensitivity analysis indicates that cmo tranche valuation is not particularly sensitive to alternative models of the term structure so long as the models are consistent with the current yield curve but even when alternative specifications of the refinancing cost categories generate nearly identical values for the collateral underlying the cmo i e the generic mortgage backed securities the resulting tranche values can differ widely between the two specifications the results point out the importance of accurate estimation of the distribution of refinancing costs when the rational valuation model is used for the analysis of cmo tranches

the demand for dairy products structure prediction and decomposition this article presents an analysis of the demand for dairy products first the structure of dairy product demand is estimated using the household food consumption survey data under the assumption of a two stage budgeting procedure a complete demand system for food incorporating demographic effects is estimated next using the demand relations estimated from cross section data prediction interval tests utilizing time series data are performed for milk and butter last factors affecting consumption are classified into economic and demographic effects and a decomposition of the causes of changes in demand over time is performed

welfare consequences of food prices increases evidence from rural mexico this paper presents an analysis of the welfare consequences of recent increases in food prices in mexico using micro level data we estimate a quaids model of demand for food using data collected to evaluate the conditional cash transfer program oportunidades we show how the poor have been affected by the recent increases and changes in relative prices of foods we also show how a conditional cash transfer program provides a means of alleviating the problem of increasing staple prices and simulate the impact of such a policy on household welfare and consumer demand we contrast this policy with alternative policy responses such as price subsidies which distort relative prices and are less well targeted

quality quantity and spatial variation of price back to the bog abstract estimating potential effects of price reforms is a key issue for many developing countries demand studies increasingly use household survey data on budget shares which vary with quantity price and quality if quality response to price is ignored estimated price elasticities of quantity demand conflate responses on quantity and quality margins our review finds over 80 of published studies using budget shares from household survey data have this error we use survey data from vietnam with prices and qualities observed over space to directly estimate the price elasticity of quality this is much larger than what is derived from the income elasticity of quality based on the deaton 1988 separability restrictions across the 45 items we study the own price elasticity of quantity demand is overstated by a factor of four on average if the response of quality to price is ignored

calculating rural urban food price differentials from unit values in household expenditure surveys a comparison with existing methods and a new procedure while purchasing power parity ppp between countries has received a great deal of attention ppp calculations within countries have received less attention the idea that one unit of currency has the same purchasing power in all regions in large countries is false this paper addresses this limitation by proposing a methodology for calculating rural urban ppp in india the paper introduces a concept of item specific ppp that exploits the analogy with an item specific equivalence scale the methodology relies on demographically varying preferences to estimate ppp the results underline the need to incorporate spatial differences in ppp calculations in countries with heterogeneous preferences copyright 2012 oxford university press

prices and unit values in poverty measurement and tax reform analysis researchers often use unit values household expenditures on a commodity divided by the quantity purchased as proxies for market prices when calculating poverty lines and estimating consumer demand equations such proxies are often needed because community price surveys in developing economies are either absent or suffer quality problems however using unit values may result in biases due to measurement error and quality effects in a household survey experiment information on prices was obtained in three ways from unit values from a market price survey and from the opinions of householders who were shown pictures of items and asked to report the local price the three sets of price data are used to calculate poverty lines estimate price elasticities and analyze marginal tax reforms there are substantial biases when unit values are used as a proxy for market price even when sophisticated correction methods are applied performance was better for the price opinions of household members the results highlight the importance of price collection methods and the need to consider the wider costs of having potentially unreliable community level price data

do multinationals deteriorate developing countries export prices the impact of fdi on net barter terms of trade this paper explores the economic relationship between foreign direct investment fdi to developing countries and the export prices of the latter measured by terms of trade it is rst shown that economic theory suggests such a relationship for various reasons but is inconclusive about the direction of the eect to address this open issue empirically i analyze data on more than 50 developing countries throughout the period 1980 2008 using robust dynamic panel data methods the results show that fdi had an economically relevant and statistically signicant positive impact on developing countries net barter terms of trade a higher level of education in the developing country fosters this eect

hicksian separability does not hold over space implications for the design of household surveys and price questionnaires abstract if relative prices of goods within a commodity group are constant hicksian separability lets the price of a single good represent the group price level this is relied on by price questionnaires used with household surveys in developing countries and when constructing temporal and spatial deflators methods of estimating demand systems from household survey data also rely on hicksian separability yet this restriction remains untested in cross sections we use unique data from vietnam with multiple specifications from within the same food groups to test if within group relative prices are constant over space the data firmly reject these restrictions some guidelines for survey design are discussed in terms of the characteristics of commodity groups that should be disaggregated and those that should have more elementary goods added to their linked price questionnaire

the application of neural networks to the divisia index debate evidence from three countries if monetary policy is to be effective in controlling the macroeconomy accurate measurement of the money supply is essential the conventional way of measuring the level of the money supply is to simply sum the constituent liquid liabilities of banks however a more sophisticated weighted monetary index has been proposed to take account of the varying degrees of liquidity of the short term instruments included in money inferences about the effects of money on economic activity may depend importantly on the choice of monetary index because simple sum aggregates cannot internalize pure substitution effects this hypothesis is investigated in the current paper a divisia index measure of money is constructed for the usa uk and italian economies and its inflation forecasting potential is compared with that of its simple sum counterpart in each of the three countries the powerful artificial intelligence technique of neural networks is used to allow a completely flexible mapping of the variables and a grea

the global food crisis disaster opportunity or non event household level evidence from cote d ivoire summary using 2008 lsms data for cote d ivoire we study the welfare implications of the price increase of key imported staple food rice and consider the consumption smoothing effect of locally produced food and cash crop varieties while middle income urban households are adversely affected by rising rice prices relatively poor rural households benefit availability of local staple alternatives leads to further income redistribution from net consumers toward net producers of staples by contrast the ability to generate income from tropical cash crops not only improves the welfare of rural households but helps smooth the consumption of urban households

the demand for meat and fish in spain urban and rural areas abstract the aim of the paper is to explain to what extent meat consumption patterns in spain are different in rural and urban areas and which are the factors explaining differences and similarities a demand system using cross section data from the latest spanish national survey has been estimated unit values have been used instead of market prices and price and quality effects have been obtained the main conclusion is that meat consumption patterns in urban and rural areas are not really different as regards economic factors some small income and price effect differences have been found specially for fresh pork and fish responses to changes in income and price are higher for fresh pork consumption in rural areas and for fish in urban areas

one divisia money for europe in 1992 the eu monetary authorities adopted a harmonized broad money aggregate the emi was subsequently established to promote monetary policy coordination this paper considers how broad money aggregates might be used to guide eu monetary policy and whether a euro divisia monetary index might provide a better guide than a euro simple sum aggregate our findings are based on data from the uk france and germany they indicate that euromoney granger causes europrices and that the eurodivisia monetary index is a better leading indicator of euroinflation than the euro simple sum monetary aggregate

price unit value and quality demanded abstract given the paucity of quality price data it is common to rely on unit value average expenditure per unit as a proxy for price but this is an imperfect proxy if households respond to price increases by substituting to lower quality goods this paper draws on survey data that contain both unit value and price to estimate the severity of quality substitution in indonesia finding that it is prevalent the paper next calculates price elasticities that correct for quality substitution evaluating and ultimately rejecting a commonly used method for calculating price elasticities using only unit value data finally it demonstrates that quality substitution can result in biased price elasticities even when price is perfectly observed

preferences spatial prices and inequality abstractthis study examines the effect of prices on inequality in rural india during the period of economic reforms and beyond 1999 2000 2009 2010 it proposes a framework for calculating exact price indices based on the exact affine stone index easi demand system and shows its usefulness by calculating spatial prices and regionally varying temporal prices that allow for both differences in preferences between states and over time the study finds that the nature of inflation has been regressive during 1999 2000 2004 2005 and progressive during 2004 2005 2009 2010 and that the effects of temporal price inflation and spatial prices on inequality are qualitatively different

the short run impact of import bans on poverty the case of nigeria 2008 2012 the nigerian government uses food import prohibition as part of policies that seeks to protect existing domestic producers and reduce the country s dependence on imports this paper argues that such policies have negative effects on net consumers of such products due to higher prices with 70 percent of poor households budget spent on food and about 13 percent of the total budget devoted to products subject to import bans poor households are vulnerable to such trade policies prices of some import prohibited food products are found to be higher than what they would be in the absence of such bans the elimination of import bans is estimated to reduce national poverty rates by as much as 2 6 percentage points

consumer theory and the demand for money the following sections are included introductionthe definition of moneythe microeconomic theory of a monetary economythe aggregation theoretic approach to money demandindex number theorythe links between aggregation theory index number theory and monetary theoryunderstanding the new divisia aggregatesthe optimal level of monetary subaggregationeconometric considerationsapproximating the monetary services subutility functionan exampleempirical dimensionsempirical comparisons of index numbersempirical results for the demand system approachextensionsconclusions this abstract was borrowed from another version of this item

relative prices in the uk personal sector money demand function nonparametric demand analysis is used in order to establish admissible monetary aggregates and also to establish a potential role for relative prices in the money demand function a conventional money demand specification is then contrasted with a money demand function which contains the relative prices of durables nondurables and services as additional regressors evidence from long run cointegration analysis short run error correction models and nonnested testing all confirm a role for relative prices in the u k personal sector s money demand function copyright 1996 by royal economic society

the quantity and variety of households meat purchases a censored demand system approach this study investigates the demand for 10 disaggregated meat products by u s households a censored demand system which imposes budget constraints in both observed and latent shares is estimated along with a detailed explanation of the estimation procedure additional details about the methodology not provided in previous studies should help researchers to empirically apply the model an innovation of the study is to introduce the censored demand system model for studying the variety of a household s food purchases most households buy between seven and eight different products and hardly change the variety of their purchases with changes in meat expenditure