marshall s scale economies using panel data this paper estimates plant level production functions for machinery and high tech industries that allow for scale externalities from other plants in the same industry locally and from the scale or diversity of local economic activity outside the own industry the paper finds that the count of other own industry plants representing a count of local information spillover sources has strong productivity effects in high tech but not machinery industries single plant firms both benefit more from and generate greater external benefits than corporate plants given their greater reliance on external environments on dynamic externalities high tech single plant firms benefit also from the scale of past own industry activity i find little evidence of economies from the diversity or scale of local economic activity outside the own industry

a large scale mapping of territorial development dynamics in latin america summary this paper summarizes a study of changes in per capita income monetary poverty and income distribution in 9 045 subnational administrative units of nine latin american countries between the mid 1990s and mid 2000s the results largely support spatial convergence of mean household incomes although the estimates indicate it has been slow territorial inequality is found to be persistent and reduces the pro poor effect of local income growth although national context specific the estimates also indicate that territorial development dynamics are influenced by the structural features of the territories in view of the evidence territorial development policies in latin america seem well warranted

spatial patterns of private sector and public sector non agricultural jobs in rural northeast thailand lohmann c and liefner i spatial patterns of private sector and public sector non agricultural jobs in rural northeast thailand regional studies published evidence from developing countries shows that in rural areas participation in non agricultural wage employment rises with proximity to urban centres while earnings do not this paper explores the reasons for this phenomenon analysing the job characteristics of rural workers in detail the data set consists of 900 jobs the results show that public jobs are over represented in rural remote regions driving up the mean wage of this type of region when considering private sector employment only spatial wage and income differentials do exist showing that workers in remote areas are economically more disadvantaged than workers in peri urban areas

measuring urban economic density agglomeration economies are at the heart of urban economics driving the existence and extent of cities and are central to structural transformation and the urbanization process this paper evaluates the use of different measures of economic density in assessing urban agglomeration effects by examining how well they explain household income differences across cities and neighborhoods in six african countries the paper examines simple scale and density measures and more nuanced ones that capture the extent of clustering within cities the evidence suggests that more nuanced measures attempting to capture within city differences in the extent of clustering do no better than a simple density measure in explaining income differences across cities at least for the current degree of accuracy in measuring clustering however simple city scale measures such as total population are inferior to density measures and to some degree misleading the analysis finds large household income premiums from being in bigger and particularly denser cities over rural areas in africa indicating that migration pull forces remain very strong in the structural transformation process moreover the marginal effects of increases in urban density on household income are very large with density elasticities of 0 6 in addition to strong city level density effects the analysis finds strong neighborhood effects for household incomes overall city density and density of the neighborhood matter

productivity gains from geographic concentration of human capital evidence from the cities abstract based on recent theoretical developments the argument is made that the average level of human capital is a local public good cities with higher average levels of human capital should therefore have higher wages and higher land rents after conditioning on the characteristics of individual workers and dwellings this prediction is supported by data for standard metropolitan statistical areas smsas in the united states where the smsa average levels of formal education and work experience are used as proxies for the average level of human capital the alternative explanations of omitted smsa variables and self selection are evaluated an estimate of the effect of an additional year of average education on total factor productivity is computed

people places and earnings differentials in scotland abstractpeople places and earnings differentials in scotland regional studies this paper investigates the contribution of people and place effects to earnings differentials in scotland using individual and regional data the main sources of differentials are attributed to workers characteristics people effects particularly academic and vocational qualifications followed by occupational and industrial affiliations on the other hand differences in the attributes of local area labour markets place effects explain only a small part of individual earnings differentials the most relevant spatial attribute is local area human capital the findings suggest that people based policies are likely to be more effective at improving workers earnings prospects than place based policies

frictional labour mobility we build a dynamic model of migration where in addition to standard relocation costs workers face spatial frictions that decrease their ability to compete for distant job opportunities we estimate the model on a matched employer employee panel dataset describing labour market transitions within and between the 100 largest french cities our identification strategy is based on the premise that frictions affect the frequency of job transitions while mobility costs impact the distribution of accepted wages we find that 1 controlling for spatial frictions reduces mobility cost estimates by one order of magnitude 2 the urban wage premium is driven by better opportunities for local job to job transitions in larger cities 3 migration reduces lifetime inequalities by providing insurance against unsatisfactory initial location draws 4 labour mobility policies based on relocation subsidies are inefficient unlike switching from nationwide to local minimum wages

urban wages and labor market agglomeration abstract using the 5 public use micro sample of the 1990 u s census we find that observationally equivalent workers in the manufacturing sector earn higher wages when they are in urban labor markets that have a larger share of national or metropolitan employment in their same occupation and industry groups quantitatively the effect is large with an elasticity measured at the means of between 1 2 and 3 6 for these effects we interpret the willingness of firms to pay more for equivalent workers in dense markets as evidence of an agglomeration economy in urban labor

energy based economic development abstract the fields of economic development and energy policy and planning have converged in recent years to form an emerging discipline which we term energy based economic development ebed despite the significant amount of stimulus funds as well as state and local funding that are being allocated to ebed initiatives in the united states the emerging discipline has received scant attention in the energy policy and development literature the link between energy and economic development in the literature is still theoretical mostly focused on the need for and the potential benefits of ebed and rarely applied furthermore funding for ebed has outpaced understanding of the discipline development of rigorous technical approaches and meaningful ways to measure impact such information would not only help practitioners and policymakers more thoroughly understand the confines of the discipline and shape goals and approaches accordingly but also help researchers identify track and evaluate a variety of activities in the field with national and international attention focused on the convergence of these fields researchers and practitioners have a rare opportunity to develop and implement the tools necessary to evaluate and communicate the potentially broader impacts that ebed may hold for society if ways to leverage and sustain the injection of funds in this discipline are not identified the opportunity may end before we can achieve either energy policy or economic development goals in an attempt to respond to this need this analysis explores the connection between energy and economic development beginning with a review of the trends in each field and the goals that each seeks to achieve on the basis of this information we define the discipline of ebed review the existing literature on it and offer insights and perspectives on its emergence

productivity and city size a critique of the evidence a critique of two leading articles in the productivity and city size literature results in revised estimates of the productivity advantages of large cities in particular extant estimates of the elasticity of productivity with city size are revised downward by over 100 percent for the manufacturing sector and about 25 percent for the entire urban economy after revision productivity advantages of larger cities are found to be much larger for the nonmanufacturing sector than for the manufacturing sector hence revitalization policies for large cities should be focused on nonmanufacturing sectors

wages rents and the quality of life this study focuses on the role of wages and rents in allocating workers to locations with various quantities of amenities the theory demonstrates that if the amenity is also productive then the sign of the wage gradient is unclear while the rent gradient is positive the theory is extended to include the housing market and nontraded goods these extensions require little modification of the conclusion the empirical work on wages shows that the regional wage differences can be explained largely by these local attributes with the use of site price data implicit prices are estimated and quality of life rankings for the cities are computed

unequal migration and urbanisation gains in china abstract we assess the role of internal migration and urbanisation in china on the nominal earnings of three groups of workers rural migrants low skilled natives and high skilled natives we estimate the impact of many city and city industry characteristics that shape agglomeration economies as well as migrant and human capital externalities and substitution effects we also account for spatial sorting and reverse causality location matters for individual earnings but urban gains are unequally distributed high skilled natives enjoy large gains from agglomeration and migrants at the city level both conclusions also hold to a lesser extent for low skilled natives who are only marginally negatively affected by migrants within their industry by contrast rural migrants slightly lose from migrants within their industry while otherwise gaining from migration and agglomeration although less than natives the different returns from migration and urbanisation are responsible for a large share of wage disparities in china

spatial wage disparities sorting matters spatial wage disparities can result from spatial differences in the skill composition of the workforce in non human endowments and in local interactions to distinguish between these explanations we estimate a model of wage determination across local labour markets using a very large panel of french workers we control for worker characteristics worker fixed effects industry fixed effects and the characteristics of the local labour market our findings suggest that individual skills account for a large fraction of existing spatial wage disparities with strong evidence of spatial sorting by skills interaction effects are mostly driven by the local density of employment not controlling for worker heterogeneity leads to very biased estimates of interaction effects endowments only appear to play a small role

technological specialization and variety in urban invention o huallachain b and lee d s technological specialization and variety in urban invention regional studies urban economic theory distinguishes between knowledge spillovers that occur within specializations and those that cross technologies empirical analysis has sought to gauge their relative strength but the results are inconclusive metropolitan specialization and variety at different aggregation levels of a us patent classification system are assessed using theil s relative entropy index the results show that specialization and variety are not competing features of urban technological structure cities can have both the invention rate positively associates with specialization in diverse technologies the cross fertilization of ideas among skilled professionals with different expertise and the interaction between specialists of narrow fields of knowledge are both important in technological advance the most inventive cities have deep specializations in different technologies the results also sho

french unemployment a transatlantic perspective french unemployment why france and the usa are alike the paper compares the french and us labour markets it shows that differences in unemployment rates are especially acute for young and old workers but appear to be negligible for middle aged workers all french workers however experience job flows that are quite distinct from their american counterparts as they are exposed to long spells of infrequent unemployment which is the opposite to the us case critical differences across ages and skills regarding the patterns of exit from and entry into employment are also displayed the paper dispels the view that these differences originate from the behaviour of the unemployed or the set of institutions that guide their decisions and that this is new to the french labour market daniel cohen arnaud lefranc and gilles saint paul

cities and the growth of wages among young workers evidence from the nlsy abstract human capital based theories of cities suggest that large economically diverse urban agglomerations increase worker productivity by increasing the rate at which individuals acquire skills one largely unexplored implication of this theory is that workers in big cities should see faster growth in their earnings over time than comparable workers in smaller markets this paper examines this implication using data on a sample of young male workers drawn from the national longitudinal survey of youth 1979 cohort the results suggest that earnings growth does tend to be faster in large economically diverse local labor markets defined as counties and metropolitan areas than in smaller more specialized markets yet when examined in greater detail i also find that this association tends to be the product of faster wage growth due to job changes rather than faster wage growth experienced while on a particular job this result is consistent with the idea that cities enhance worker productivity through a job search and matching process and thus that an important aspect of learning in cities may involve individuals learning about what they do well

mobility and the return to education testing a roy model with multiple markets self selected migration presents one potential explanation for why observed returns to a college education in local labor markets vary widely even though u s workers are highly mobile to assess the impact of self selection on estimated returns this paper first develops a roy model of mobility and earnings where workers choose in which of the 50 states plus the district of columbia to live and work available estimation methods are either infeasible for a selection model with so many alternatives or place potentially severe restrictions on earnings and the selection process this paper develops an alternative econometric methodology that combines lee s 1983 parametric maximum order statistic approach to reduce the dimensionality of the error terms with more recent work on semiparametric estimation of selection models e g ahn and powell 1993 the resulting semiparametric correction is easy to implement and can be adapted to a variety of other polychotomous choice problems the empirical work which uses 1990 u s census data confirms the role of comparative advantage in mobility decisions the results suggest that self selection of higher educated individuals to states with higher returns to education generally leads to upward biases in ols estimates of the returns to education in state specific labor markets while the estimated returns to a college education are significantly biased correcting for the bias does not narrow the range of returns across states consistent with the finding that the corrected return to a college education differs across the u s the relative state to state migration flows of college versus high school educated individuals respond strongly to differences in the return to education and amenities across states

does unmeasured ability explain inter industry wage differentials this paper provides empirical assessments of the two leading explanations of measured inter industry wage differentials 1 true wage differentials exist across industries and 2 the measured differentials simply reflect unmeasured differences in workers productive abilities first we summarize the existing evidence on the unmeasured ability explanation second we construct a simple model which shows that if matching is important then endogenous job change decisions can create important self selection biases even in first differenced estimates of industry wage differentials third we analyze a sample that approximates the experiment of exogenous job loss we find that i the wage change experienced by a typical industry switcher closely resembles the difference in the relevant industry differentials estimated in a cross section and ii pre displacement industry affiliation plays an important role in post displacement wage determination

marshall s scale economies and jacobs externality in korea the role of age size and the legal form of organisation of establishments this paper revisits the concept of agglomeration economies by estimating the effects of localisation urbanisation and local competition on labour productivity using establish ment level data in korean manufacturing industries it is found that when an establish ment locates in a more localised specialised more urbanised diversified and more competitive area its workers become more productive due to external benefits from agglomeration issues of self selection bias and omitted variable bias are addressed by instrumenting the variables measuring localisation economies and controlling for the fixed effects of establishments location and industries year however the external effects from the spatial proximity of other establishments vary across the categories of industry type age size and legal form of organisation of establishments establishments in traditional heavy manufacturing industries receive more external benefits in a less diversified area while those in transport equipment manufacturing industries enjoy the largest benefits from localisation externalities exist for establishments aged between 2 and 7 years having at least 10 workers being corporate and having multiplants or not being headquarters establishments in relatively young industries rely more on diver sified environments while establishments in relatively old industries receive greater external benefits in the same industry cluster this result supports the product life cycle location theory of duranton and puga

the migration of technical workers using panel data on the danish population we estimated the revealed preferences of scientists and engineers for the places in which they choose to work our results indicate that these technical workers exhibit substantial sensitivity to differences in wages but that they have even stronger preferences for living close to family and friends the magnitude of these preferences moreover suggests that the greater geographic mobility of scientists and engineers relative to the population as a whole stems from more pronounced variation across regions in the wages that they can expect these results remain robust to estimation on a sample of individuals who must select new places of work for reasons unrelated to their preferences those who had been employed at establishments that discontinued operations

dots to boxes do the size and shape of spatial units jeopardize economic geography estimations this paper evaluates in the context of economic geography estimates the magnitude of the distortions arising from the choice of zoning system which is also known as the modifiable areal unit problem maup we consider three standard economic geography exercises the analysis of spatial concentration agglomeration economies and trade determinants using various french zoning systems differentiated according to the size and shape of spatial units which are the two main determinants of the maup while size matters a little shape does so much less both dimensions seem to be of secondary importance compared to specification issues

marriage and the city search frictions and sorting of singles this paper develops and tests a model where cities play an important role as marriage markets the idea is simple cities are dense areas where singles can meet more potential partners than in rural areas to enjoy those benefits they are willing to pay a premium in terms of higher housing prices once married the benefits from meeting more potential partners vanish and married couples move out of the city attractive singles benefit most from a dense market and are therefore more likely to move to the city those predictions are tested and confirmed with a unique danish data set

spatial changes in labour market inequality abstract we study spatial changes in labour market inequality for us states and msas using census and american community survey data between 1980 and 2010 we report evidence of significant spatial variations in education employment shares and in the college wage premium for us states and msas and show that the pattern of shifts through time has resulted in increased spatial inequality because relative supply of college versus high school educated workers has risen faster at the spatial level in places with higher initial supply levels we also report a strong persistence and increased inequality of spatial relative demand bigger relative demand increases are observed in more technologically advanced states that have experienced faster increases in r d and computer usage and in states where union decline has been fastest finally we show the increased concentration of more educated workers into particular spatial locations and rising spatial wage inequality are important features of labour market polarization as they have resulted in faster employment growth in high skill occupations but also in a higher demand for low wage workers in low skill occupations overall our spatial analysis complements research findings from labour economics on wage inequality trends and from urban economics on agglomeration effects connected to education and technology

multilevel approaches and the firm agglomeration ambiguity in economic growth studies empirical studies in spatial economics have shown that agglomeration economies may be a source of the uneven distribution of economic activities and economic growth across cities and regions both localization and urbanization economies are hypothesized to foster agglomeration and growth but recent meta analyses of this burgeoning body of empirical research show that the results are ambiguous recent overviews show that this ambiguity is fuelled by measurement issues and heterogeneity in terms of scale of time and space aggregation growth definitions and the functional form of the models applied alternatively in this paper we argue that ambiguity may be due to a lack of research on firm level performance in agglomerations this research is necessary because the theories that underlie agglomeration economies are microeconomic in nature hierarchical or multilevel modeling which allows micro levels and macro levels to be modeled simultaneously is becoming an increasingly common practice in the social sciences as illustrated by detailed dutch data on firm level productivity employment growth and firm survival we argue that these approaches are also suitable for reducing the ambiguity surrounding the agglomeration firm performance relationship and for addressing spatial sectoral and cross level heterogeneity