regional earnings differences in great britain evidence from the new earnings survey hemmings p j 1991 regional earnings differences in great britain evidence from the new earnings survey reg studies 25 123 133 previous analysis comparing earnings between regions of great britain has concentrated upon the earnings of male employees using a large micro data base this paper takes a broader approach by examining earnings differences for female and part time employees as well as male employees human capital models are used to explain the variation in earnings in terms of characteristic differences and reward effects a restricted model with no regional element is tested against more general models which allow for regional variation in the constant term only and in both the constant and coefficients of the equations the most general model indicates that equations for the earnings of males display greater regional heterogeneity than those for females whilst the south east of england is the most distinctive region in terms of employee characteristics and in the returns to those e

a natural rate model of frictional and long term unemployment a simple labor market with spatial separation and markov production shocks is presented in the stationary equilibrium some workers are frictionally unemployed and others are long term unemployed the amounts of frictional and long term unemployment at each location depend on its recent history of productivity shocks producing a local hysteresis effect changes in the parameters affect the equilibrium aggregate amounts of frictional and long term unemployment differently in particular economies with larger moving costs will have more long term and total unemployment but less frictional unemployment this finding is broadly consistent with recently reported stylized facts

agglomeration economies and industrial decentralization the wage productivity trade offs abstract this paper examines the industrial location trade offs between the productivity advantages of the metropolitan center and the lower land and the labor costs in outlying regions within the state of sao paulo brazil the results indicate that while plant productivity is enhanced by the considerable agglomeration economies existing within metropolitan sao paulo firms must pay for these benefits in high wages and land costs offsetting labor cost savings can be achieved by locating in outlying regions the evidence presented in this paper suggests that market forces may lead eventually to a spontaneous decentralization of industry

the effect of subscription video on demand on piracy evidence from a household level randomized experiment we partner with a major multinational telecommunications provider to analyze the effect of subscription video on demand svod services on digital piracy for a period of 45 consecutive days a group of randomly selected households who used bittorrent in the past were gifted with a bundle of tv channels with movies and tv shows that could be streamed as in svod we find that on average households that received the gift increased overall tv consumption by 4 6 and reduced internet downloads and uploads by 4 2 and 4 5 respectively however and also on average treated households did not change their likelihood of using bittorrent during the experiment our findings are heterogeneous across households and are mediated by the fit between the preferences of households in our sample for movies and the content available as part of the gifted channels households with preferences aligned with the gifted content reduced their probability of using bittorrent during the experiment by 18 and decreased their am

local pay determination theoretical models of local pay are reviewed ranging from neoclassical perspectives unemployment wage trade off models and segmented labor market approaches the empirical work on u s north south differentials is discussed for the u k studies of the extent of and trends in geographical pay differentials are considered as well as behavioral explanations focusing on the role of excess demand the issue of adjustment processes is then discussed both in theory and in relation to empirical work for the u s and u k this discussion focuses largely on geographical spillover effects in terms of origins evidence and issues of identification finally the impact of certain impediments in the adjustment process are considered specifically in relation to the u k these concern the role and influence of national wage bargaining as well as factors inhibiting labor migration stemming from the housing market and the climate of the national labor market copyright 1992 by blackwell publishers ltd

the impact of equal opportunity policy on sex differentials in earnings and occupations women began to enter nontraditional occupations at an increasing rate at the same time federal equal opportunity policy was strengthened in 1972 equal employment opportunity eeo policy was strengthened and expanded and equal opportunity in education became federal policy for the first time these policies constitute a two pronged attack on sex discrimination because they address impediments to mobility on both the demand and supply sides of the labor market together they should increase women s access to nontraditional jobs and to the skills necessary to perform them during the 1970 s women made occupational gains that are concentrated disproportionately in the white collar occupations one explanation for this is that the impact of federal equal opportunity policy differs across schooling levels in section i i discuss federal equal opportunity policy section ii contains empirical evidence on the direct effects of eeo policy on sex differentials in earnings and occupational segregation by sex section iii presents estimates of changes in the effect of schooling on women s entry into nontraditional occupations during the 1970 s and attempts to determine what portion may be due to equal educational opportunity policy and to indirect effects of eeo policy

customer markets credit market imperfections and real price rigidity according to standard theory an increase in demand should raise prices of goods given factor prices empirically however prices appear to be unaffected by short run variations in demand this paper suggests an explanation of this observation if customers react slowly to price changes and credit markets are imperfect prices may be unchanged or even fall when demand increases the reason is that when demand is high profits are high and firms can compete more intensely for customers without increasing their borrowing copyright 1991 by the london school of economics and political science

capital skill complementarity and the interregional distribution of human capital in us manufacturing 1989 capital skill complementarity and the interregional distribution of human capital in us manufacturing applied economics vol 21 no 8 pp 1087 1098

trends in earnings differentials by gender 1971 1981 this paper clarifies trends in relative earnings by sex over the decade 1971 1981 and decomposes these trends to determine which factors contributed to a decline and which to an increase our analyses are based upon data from the annual demographic files of the current population survey for 1972 and 1982 this study is unique in that it estimates earnings functions in each year which are corrected for selectivity bias it is found that such a correction markedly raises the progress of white women relative to men among blacks the impact of the selectivity bias correction was to substantially lower the relative earnings increase of women however the coefficients on the selectivity variable were not significant the findings suggest declining sex role specialization and discrimination as conventionally measured over the decade on the other hand contrary to expectations the total effect of variables reflecting the sex composition of the individuals occupation worked to widen the sex differential over the period the sex differential was also adversely affected by a decline in the relative return to education especially for whites authors modified

alternative models of earnings determination and labor market structures there are three distinct research traditions in the analysis of individual earnings determination human capital or earnings function analyses aggregate wage analyses and labor demand analyses an important and incongruous aspect of each is the treatment of geographical differences in labor markets this paper first investigates the magnitude and character of geographical wage differentials the sizable differences discovered there are then related to the existing and highly simplified models of labor market differences while the two major classes of models compensating differentials and labor demand differ significantly in assumptions and implications it is impossible to distinguish adequately between them there appears to be a clear need for more structural analyses of labor market operations

wage differentials across labor markets and workers does cost of living matter wage differentials studies rarely account for interarea differences in cost of living owing both to data limitations and theoretical ambiguity this study develops a price index for 185 metropolitan areas comprising about 70 of the u s labor force current population survey data for 1985 95 and data on sitespecific amenities are used to estimate earnings differentials based on nominal wages wages fully adjusted for measured cost of living and a simple approximation of real wages with partial adjustment for pricelevel differences dispersion in approximate real wages across 185 labor markets and differentials by region and city size are substantially lower than dispersion in nominal or full adjustment wages estimates of racial and ethnic differentials display moderate sensitivity to choice of a wage measure whereas other standard differentials do not both nominal wages and wages fully adjusted for cost of living may provide misleading estimates of real wage differentials absent data on interarea prices and amenities researchers should include detailed controls for region and city size in nominal wage equations jel j31 r23

changes in the cyclical pattern of real wages evidence from nine countries 1955 80 monetary policy in the united kingdom the monetarist vice has gripped the economy even longer and similar deflationary policies have been in effect in other western economies interestingly enough these policies were instituted in the context of a prolonged period of economic decline annual average rates of growth of gross domestic product for nine oecd countries fell from 6 8 to 5 o to 2 6 over the periods i955 66 i966 73 and i973 79 2 similarly unemployment has risen dramatically in the last io years the causes of slow growth and high unemployment are undoubtedly various however it is clear that restrictive macroeconomic policy has played an important role that is the recent situation is at least in part attributable to a deliberate effort to induce an economic slump the task of systematically examining the origins and motivations of this policy still awaits us however this paper presents an account of a general development in the pattern of real wages over the business cycle which is a plausible determinant of current policy the evidence indicates that short run cyclical movements in output no longer exert a determinate influence on real wage growth a development which may have been the impetus for long term deflation this account is based on an econometric study of nine countries over the period i955 80 the study has three noteworthy econometric features the first is that data from the nine countries are combined in a pooled model with homogeneous coefficients the use of a cross national sample ensures against the attribution of general theoretical status to particular empirical findings from a single country 3 second the units of observation are business cycle turning

buying sharing and renting information goods information goods such as books journals computer software music and videos can be copied shared resold or rented when such opportunities for sharing are present the content producer will generally sell a smaller amount at a higher price which may increase or decrease profits i identify three circumstances where profits increase 1 when the transactions cost of sharing is less than the marginal cost of production 2 when content is viewed only a few times and transactions costs of sharing are low and 3 when a sharing market provides a way to segment high value and low value users

accounting for south non south real wage differentials and for changes in those differentials over time a unified accounting framework for analyzing differences in real wages between the south and non south in 1979 and for changes in south non south wage ratios between 1973 and 1979 is outlined cross section analysis of real wage differentials allows two sources of regional wage variation 1 worker and job characteristics and 2 returns to those characteristics our results suggest that differences in the latter may be as important in accounting for regional wage differentials as the former an interactive specification permits decomposition of changes in regional wage ratios into direct effects of changes in characteristics and indirect effects of region year and region year variations in returns more than half the predicted changes in south non south wage ratios can be accounted for by changing relative returns to characteristics between the south and non south

identifying productivity and amenity effects in interurban wage differentials this study focuses on the relative importance of amenity and productivity differences in determining wage differentials across urban areas the approach developed takes advantage of the connection between land and labor market clearing conditions required for locational equilibrium of households and firms data on recent movers are used to estimate equilibrium wages and rents for a sample of metropolitan areas this information is then used to identify amenity and productivity components of wages for each city in the sample using national estimates of the relative share of land in consumption and production differences in productivity and amenities are found to be roughly equal sources of wage variation across the sample

the convergence of fiscal regimes and the decline of the tiebout effect i have argued that the spatial convergence of per capita incomes and income distributions lead to the spatial convergence of fiscal regimes and that convergence diminishes opportunities for tiebout type moves in the economy considerable empirical evidence confirms the hypothesis states with relatively low initial levels of taxation have had relatively higher growth rates of taxation low per capita income states have had higher growth rates of real per capita incomes than have had high per capita income states the high economic growth rate states have had lower growth rates of taxation than the low income growth rate states spatial convergence of per capita incomes is associated with spatial convergence of fiscal regimes furthermore there has been a spatial convergence in income distributions increased equality of income empirically is associated with increased size of the fiscal regime confirming the public choice insight the spatial convergence of fiscal regimes has diminished the gains from tiebout type moves as such fiscal convergence diminishes the opportunity for citizen voters to reveal their preference for collective goods through migration of course at the limit where per capita incomes and the income distribution are invariant spatially the spatial convergence of fiscal regimes makes the musgrave samuelson problem of revealed preference for collective goods as intractable at the state and local levels as at the national level tiebout type moves no longer allow escape from leviathan

urban agglomeration capital augmenting technology and labor market equilibrium abstract the objective of this paper is to measure urban productivity using japanese city based cross sectional data of 1980 the results of a labor demand ols regression analysis suggest two kinds of possible model specifications capital augmenting and demand supply equilibrium each model type is considered and the average effect of population density on labor productivity is shown to be 4 3 in the capital augmenting model and 8 0 in the equilibrium model

the anticipated real interest rate capital utilization and the cyclical pattern of real wages abstract this paper develops a channel through which increases in anticipated real interest rates can be expansionary for current aggregate labor demand and current output supply the key feature of the model is the introduction of a user cost of capital utilization which confronts the firm with the intertemporal problem of the optimal choices of capital utilization and depreciation the resulting variation in capital utilization and capital services in response to fluctuations in the real rate of interest shifts the marginal product of labor and thus the demand for labor at the same time and in the same direction that lucas rapping real interest rate effects operate on labor supply the complete model places no a priori restrictions on the cyclical pattern of real wages thus avoiding the countercyclical real wage prediction made by keynes and various classical writers that is rejected by the data estimates of a labor demand schedule for the annual u s data reveal a significantly positive real interest rate effect

amenities and regional differences in returns to worker characteristics average wages in regions in the united states vary considerably in trying to explain these differences in the average wage across regions a number of studies have found that differences in the returns to characteristics of workers such as years of schooling are as important as differences in the skill composition of the labor force 4 6 10 141 these differences in returns are generally interpreted as reflecting regional differences in demand for worker characteristics coupled with barriers to factor mobility this interpretation is based on the argument that the presence of at least one perfectly mobile factor with perfect information will cause spatial convergence in characteristic prices as that particular factor exploits any spatial price differential 4 p 2161 this paper suggests an alternative to this demand based explanation for regional differences in the structure of wages one based on regional differences in the supply of worker characteristics this explanation does not rely on impediments to the movement of workers or firms and is consistent with an equilibrium view of wages in which regional wage differentials are viewed as compensation for local amenities the theoretical model presented in the following section assumes capital and labor are perfectly mobile with perfect information implying that in equilibrium the utility of workers with similar characteristics is the same in all locations this convergence of utility however does not necessarily imply convergence of characteristic prices equilibrium differences in the returns to a specific worker characteristic can exist if worker characteristics affect an individual s valuation of an area s amenities relative to the individual s demand for land

empirical age earnings profiles the human capital earnings function in which earnings are expressed as a quadratic in potential experience is probably the most widely accepted empirical specification in economics in spite of its widespread acceptance the human capital earnings function provides a very poor approximation of the true empirical relationship between earnings and experience the standard formulation understates early career earnings growth by about 30 50 and overstates midcareer growth by 20 50 however simple alternative specifications that fit the data are available

causes of the current stagflation since 1975 labour slack has been unusually high in the oecd countries and yet inflation has not diminished the less favourable mix of unemployment and rate of change of inflation which we call stagflation is explained by a fall in the feasible rate of growth of real wages unmatched by a reduction in the constant term in phillips curve to investigate this mechanism conventional wage and price equations are estimated for 19 countries and then used for simulation stagflation has been caused in roughly equal amounts by rising relative import prices and by the fall in the rate of productivity growth in the basic model the phillips curve is assumed not to adapt to falls in feasible real wage growth but in a final section an adaptive wage equation is estimated which confirms that the process of adaptation is slow

real wage and real labour cost growth 1948 81 a disaggregated study the paper examines growth rates in labour cost and real wages for up to 38 separate uk industry categories this reveals much interesting information about labour markets which is ignored in most studies of the real wage the latter are mostly concerned with disequilibrium behaviour of the real wage the theoretical section of the paper explores the relationship between the growth rates in productivity real wages labour costs profit rates and value added prices relative to average prices under the assumption that factor markets are competitive the second section computes these respective growth rates and explores how well the competitive hypothesis stands up the results indicate reasonable agreement with the competitive thesis

the distribution of regional earnings in the uk utilizing a micro sample of 7317 individuals extracted from the general household survey 1973 we show that money earnings and real earnings vary considerably across british regions even when other factors such as education and industry mix are held constant we also find that real earnings do not follow the pattern of money earnings if anything quite the reverse whereas monetary rewards are the greatest in the south east of england real rewards are the greatest in the midlands and the north east of england scottish regions however appear to fare the worst in both money and real terms

wages rents and amenities differences among workers and regions what explains persistent regional earnings differences this paper argues that regional differences in amenities can account for the wage differences in contrast cost of living variations do not account for wage differences but actually exacerbate them this conclusion results from a model in which variations in rents and wages are equalizing differences for amenity differences empirical results are consistent with the model

labor market discrimination against hispanic and black men h ispanic american men have lower average wage rates than white non hispanics in 1975 the average white non hispanic male wage earner in the united states earned 5 97 an hour mexican men earned 4 31 72 as much as white non hispanics puerto rican men earned 4 52 76 as much and cuban men earned 5 33 89 as much as white non hispanics by way of comparison black men s average wages in 1975 were 4 65 78 of the white male wage several possible reasons for the hispanics lower wages come to mind among them are age and education geographic location immigration language difficulties and discrimination for example as shown in table 1 mexicans and puerto ricans are younger on average than the white non hispanic population and earnings tend to rise with age hispanics have lower average levels of education than white non hispanics and wages are positively associated with education many mexican americans live in the southwest where prices are relatively low moreover hispanics are more likely to be recent immigrants and to lack fluency in english than white non hispanics and so to be at a disadvantage in the labor market in addition there is a widespread belief that hispanics suffer from employment discrimination and cannot obtain the wages that their human capital would command if they were non hispanic whites how much of the wage differentials described above are due to each of these factors and to other inter group differences in wage related characteristics in particular how much impact does labor market discrimination have on the average hispanic man s wage and how does this compare with discrimination against blacks this paper provides answers to these questions a few other efforts have been made to analyze the relative earnings of hispanic and white nonhispanic men using 1960 and 1970 census data fogel 1966 poston and alvirez 1973 poston alvirez and tienda 1976 long 1977 and gwartney and long 1978 we use more recent data from the 1976 survey of income and education this data set enables us to measure wage rates more accurately and to specify the wage function more completely than does the census unlike previous analysts in estimating the wage function we take account of possible selectivity bias due to the distinction between average wage offers and average observed wages thus we hope to obtain a more accurate and up to date measure of labor market discrimination against hispanic men section ii explains the method used to separate the minority white non hispanic wage differential into the portions due to differences in average characteristics and the portion due to differences in unobserved factors and discrimination taking into account the possibility of selectivity bias in the observed wage sample section iii describes the data used in the study and the specification of the wage equation the breakdown of the observed wage differentials into components due to differences in participation in the wage and salary sector local price levels average characteristics and discrimination are presented in section iv section v summarizes our findings and discusses their implications for efforts to improve the economic situation of hispanics in the united states

congressional tenure myth and reality congressional tenure is longer now than in earlier times but it is largely a myth that the era of the professional politician is a modern phenomenon here tenure is compared between the 57th and 86th congresses tenure is linked to a simple median voter model increased tenure is associated with an increased ability to transfer government expenditures to the political unit the increased size of government at the time of the 86th congress compared to the 57th congress largely explains the greater length of time in office the higher tenure of southern legislators is linked to lower per capita incomes

the employment real wage relationship an international study the neoclassical and keynesian theories of employment both predict an inverse relationship between employment and real wages in the short run the observed correlation between employment and real wages however has usually failed to conform to this prediction dunlop 1938 and tarshis 1939 reported a positive correlation between real and money wages which given procyclical movement of money wages was interpreted as evidence against the theoretical prediction the statistical significance of these results was however challenged by ruggles 1940 and tobin 1948 more recent studies by kuh 1966 and bodkin 1969 failed to detect a significant relationship between real wages and employment these findings stimulated a series of contributions by solow and stiglitz 1968 barro and grossman 1971 1976 and others developing alternative models not apparently refuted by the evidence barro and grossman recast macro theory under the assumption that markets did not clear modigliani 1977 argued that the observed relationship between employment and real wages could be accounted for in an oligopolistic model of firm behavior thus both the competitive and equilibrium assumptions of the classical model were diagnosed as the sources of its apparent empirical refutation

compensating differences and interregional wage differentials interregional differences in average wages and earnings have been observed particularly in the north and south of the united states ever since the mid 1800s that observation has motivated several empirical attempts to determine the source of those differentials measured both in nominal and real terms and to explain why they have been maintained over time the general conclusion reached by the overwhelming majority of these studies is that the labor market has not eliminated these wage differentials even in the face of substantial interregional migration this result has at least two alternative interpretations first it would appear to contradict the theory of compensating differences as applied to the labor market thaler and rosen 1975 which stresses that under the assumptions of perfect information free geographic and intersectoral labor mobility and homogeneous consumer tastes the nominal wage rates of workers who have similar human capital characteristics live and work in similar environments and experience similar living costs are driven to equality second this result may only reflect an aggregation error in other words there may be several types of labor that are each paid different equilibrium wage rates and comprise different percentages of the workforce in each region even if the real wage paid to each class of workers is interregionally invariant a situation that instead would support the theory of compensating differences failure to distinguish accurately between labor types could produce the illusion of a wage differential this paper considers the two alternative interpretations given above as to why interregional wage differentials might exist hedonic real wage equations are estimated for four regions of the united states using observations on individual household heads drawn from the 1976 panel study in income dynamics psid this sample is of interest because the 1976 psid data contain unusually detailed measures of education work experience and occupation as well as information on workplace and job characteristics thus a more complete specification of the wage equation is permitted and the possibility of aggregation error is reduced particularly in comparison with other interregional wage differential studies several of these studies for example have been based on aggregate data from the census of manufactures fuchs and perlman 1960 gallaway 1963 scully 1969 and coelho and ghali 1971 which provide no direct measurements on the human capital of workers the remainder of the discussion is organized into three sections section ii specifies the wage equation and describes the psid data section iii then reports empirical results which are consistent with the findings based on aggregate data of bellante 1979 and coelho and ghali 1971 in that they support the theory of compensating differences more specifically for full time workers the rewards to attributes relevant in determining real wages apparently are interregionally invariant however because this result conflicts with most previous research on interregional wage differentials based on aggregate data and virtually all such research based on microdata welch 1966 hanoch 1967 hanushek 1973 1981 hirsch 1978 and sahling and smith 1983 a number of empirical comparisons are made between the present study and the approaches taken by other investigators conclusions and implications are drawn out in section iv

energy substitution in u s manufacturing a regional approach one response of economists to energy market developments of the 1970s was to launch a series of studies in which the objective was to estimate energy substitution parameters characterizing important sectors of the u s economy relatively high substitution elasticities between energy and other inputs would permit firms to mitigate the effects of energy price increases by shifting to less energy intensive factor proportions the seminal work in this effort was carried out by berndt and wood 5 griffin and gregory 14 pindyck 28 halvorsen 16 and fuss 12 the research was substantially abetted by developments in production theory where the work of mcfadden 23 diewert 8 and christensen jorgenson and lau 6 yielded new and flexible production and cost function forms empirical work on energy substitution has continued 2 for the most part the data analyzed have been highly aggregative applying to say total u s manufacturing or perhaps to the various two digit sectors comprising that total to date little effort has been given to investigating energy substitution relationships at the regional level in the u s this is unfortunate since we know that the u s economy is actually composed of regions which are differently endowed with resources have developed at different rates and are comprised of different sectoral mixes the distinct possibility exists that regions differ in terms of the way in which energy inputs relate to other inputs in production furthermore even though the energy crisis may seem to be a national phenomenon national policy responses are worked out within a context of shifting and colliding regional conflicts stemming in large part from real or imagined perceptions of how energy market developments impact different regions it would seem especially important therefore to identify

factor endowments heterogeneous labor and north south migration the relationship between the relative factor endowments of heterogeneous labor in the north and south of the united states and interregional labor migration is examined the purpose of the present paper is to make explicit a sufficient set of conditions that will support a factor endowment based migration model and to evaluate the advantages and weaknesses of that model the models predictions are tested using data from the 1970 census excerpt

piracy on the silver screen using survey data on movie consumption by about 500 university of pennsylvania undergraduate students we ask whether unpaid consumption of movies displaces paid consumption a variety of cross sectional and longitudinal empirical approaches show large and statistically significant evidence of displacement in the most appropriate empirical specification we find that unpaid first consumption reduces paid consumption by about 1 unit unpaid second consumption has a smaller effect about 0 20 units our analysis indicates that unpaid consumption which makes up 5 2 per cent of movie viewing in our sample reduced paid consumption in our sample by 3 5 per cent

changes in relative wages and family labor supply the large changes in relative wages that occurred during the 1980s provide fertile ground for studying the behavioral responses of married couples to the wage changes of husbands and wives i find estimates of own wage and cross wage elasticities for men that are very small the own wage elasticity for women is positive and the cross wage elasticity for women suggests a strong negative response of female labor supply to changes in their husband s wages family labor supply behavior determines how changes in individual wage rates translate into family earnings changes the responses of women to changes in their husband s wages attenuated somewhat the increases in individual wage inequality at the family level the results suggest that the earnings of the wives of low income men would actually have fallen over the decade if women s labor supply did not respond to changes in their husbands wages however assortative mating implies that wage changes of husbands and wives are correlated and so family earnings inequality still grew during the decade of the 1980s

unemployment and the real wage the economic basis for contesting political ideologies using the keynesian theory of effective demand this paper demonstrates how particular models such as that of cooperative capitalism enunciated by the left keynesian social democrats the marxian model of profit squeeze emphasizing distributive conflict and even the conservative model relying on supply side stimulus fit in as particular variants of a more general theoretical scheme through a reconstruction of the familiar is schedule the argument is weaved around the theme of the relations between unemployment and real wage in the context of both a closed and an open economy to explain the common macroeconomic basis of contesting ideologies copyright 1990 by oxford university press

in search of a stylised fact do real wages exhibit a consistent pattern of cyclical variability the paper surveys the studies on the cyclical behaviour of real wages published from the twenties onwards the traditional simple neoclassical model of the labour market suggests that real wages tend to move countercyclically however from a theoretical viewpoint there are few reasons to expect this behaviour once the simple model is extended to account for imperfect competition uncertainty lagged responses or contracting between firms and workers empirical studies give different answers to the problem the contributions reviewed in the paper are arranged roughly in a chronological order the interwar period the postwar pre econometric studies the econometric work using aggregate data the evidence produced on the basis of longitudinal data the analyses of the shock responsiveness of real wages and finally the most recent papers attempting a reconciliation of the somewhat conflicting evidence derived from aggregate and panel data