Technology diffusion and the spatial distribution of wages in the US

What explains the spatial distribution of wages across US counties? I find that two of the most important factors are spatial technology diffusion and externalities due to the aggregate scale of production. One empirical finding supporting the importance of spatial technology diffusion is that average wages in a county decrease with the average level of schooling in neighboring counties when employment in the county and average wages in neighboring counties are held constant. All empirical results are obtained using a novel instrument for (endogenous) employment at the county-level and take into account other factors (e.g. productivity-differences across states, climate) that may determine wages.US spatial wage distribution, spatial technology diffusion, dynamic spatial externalities, spatial fixed effects

Estimating the effect of transitory economic shocks on civil conflict

This note tries to clarify some remaining issues in the debate on the effect of income shocks on civil conflict. Section 1 discusses the discrepant findings on the effect of rainfall shocks on civil conflict in Miguel and Satyanath (2010, 2011) and Ciccone (2011). Section 2 develops an instrumental variables approach to estimate the effect of transitory (rainfall-driven) income shocks on civil conflict and contrasts the conclusions with those of Miguel, Satyanath, and Sergenti (2004) and Miguel and Satyanath (2010, 2011). Throughout, the note uses the data of Miguel, Satyanath, and Sergenti to focus on the methodological issues at the core of the debate (for results using the latest data see Ciccone, 2011).transitory economic shocks, conflict, weather,

Resistance to reform: Reconsidering the role of individual-specific uncertainty

Individual-specific uncertainty may increase the chances of reform being enacted and sustained. Reform may be more likely to be enacted because a majority of agents might end up losing little from reform and a minority gaining a lot. Under certainty, reform would therefore be rejected, but it may be enacted with uncertainty because those who end up losing believe that they might be among the winners. Reform may be more likely to be sustained because, in a realistic setting, reform will increase the incentives of agents to move into those economic activities that benefit. Agents who respond to these incentives will vote to sustain reform in future elections, even if they would have rejected reform under certainty. These points are made using the trade-model of Fernandez and Rodrik (AER, 1991).Status-quo bias, bias against reform, individual-specific uncertainty

A Month-by-Month Examination of Long-Term Stock Returns

This study provides a month-by-month examination of stock returns. The results reconfirm the January Effect as well as indicate a powerful anomaly in September. Investing in the CRSP equal-weighted index in only January turns $1 in 1926 to$87.40 by 2006. The second closest month is July, during which $1 grows to$3.11. September is a poor month to invest. The $1 invested in only September decreases to a mere$0.49. The Halloween Effect vanishes once the monthly anomalies are controlled for. The September Effect is also established in four out of the five international markets tested

Human capital, the structure of production and growth

Do high levels of human capital foster economic growth by facilitating technology adoption? If so, countries with more human capital should have adopted more rapidly the skilled-labor augmenting technologies becoming available since the 1970’s. High human capital levels should therefore have translated into fast growth in more compared to less human-capital-intensive industries in the 1980’s. Theories of international specialization point to human capital accumulation as another important determinant of growth in human-capital-intensive industries. Using data for a large sample of countries, we find significant positive effects of human capital levels and human capital accumulation on output and employment growth in human-capital-intensive industries.Human Capital, Growth, Structure of Production

Indentifying human capital externalities: Theory with an application to US cities

The identification of aggregate human capital externalities is still not fully understood. The existing (Mincerian) approach confounds positive externalities with wage changes due to a downward sloping demand curve for human capital. As a result, it yields positive externalities even when wages equal marginal social products. We propose an approach that identifies human capital externalities whether or not aggregate demand for human capital slopes downward. Another advantage of our approach is that it does not require estimates of the individual return to human capital. Applications to US cities and states between 1970 and 1990 yield no evidence of significant average -schooling externalities.Human capital, Externalities, wages, downward sloping labor, demand, imperfect substitutability

Trade, extent of the market and economic growth 1960-1996

We find that trade and domestic market size are robust determinants of economic growth over the 1960-1996 period when trade openness is measured as the US dollar value of imports and exports relative to GDP in PPP US$('real openness'). When trade openness is measured as the US dollar value of imports and exports relative to GDP in exchange rate US$ ('nominal openness') however, trade and the size of domestic markets are often non-robust determinants of growth. We argue that real openness is the more appropriate measure of trade and that our empirical results should be seen as evidence in favor of the extent-of-the-market hypothesis.Extent of the market, institutions, growth

A Note on Schooling in Development Accounting

How much would output increase if underdeveloped economies were to increase their levels of schooling? We contribute to the development accounting literature by describing a nonparametric upper bound on the increase in output that can be generated by more schooling. The advantage of our approach is that the upper bound is valid for any number of schooling levels with arbitrary patterns of substitution/complementarity. We also quantify the upper bound for all economies with the necessary data, compare our results with the standard development accounting approach, and provide an update on the results using the standard approach for a large sample of countries.schooling, production, efficiency, human capital, development accounting,growth accounting

Factor Models with Real Data: a Robust Estimation of the Number of Factors

Factor models are a very efficient way to describe high dimensional vectors of data in terms of a small number of common relevant factors. This problem, which is of fundamental importance in many disciplines, is usually reformulated in mathematical terms as follows. We are given the covariance matrix Sigma of the available data. Sigma must be additively decomposed as the sum of two positive semidefinite matrices D and L: D | that accounts for the idiosyncratic noise affecting the knowledge of each component of the available vector of data | must be diagonal and L must have the smallest possible rank in order to describe the available data in terms of the smallest possible number of independent factors. In practice, however, the matrix Sigma is never known and therefore it must be estimated from the data so that only an approximation of Sigma is actually available. This paper discusses the issues that arise from this uncertainty and provides a strategy to deal with the problem of robustly estimating the number of factors.Comment: arXiv admin note: text overlap with arXiv:1708.0040

On payoff heterogeneity in games with strategic complementarities

Payoff heterogeneity weakens positive feedback in binary choice models in two ways. First, heterogeneity drives individuals to corners where they are unaffected by strategic complementarities. Second, aggregate behaviour is smoother than individual behaviour when individuals are heterogeneous. However, this smoothing does not necessarily eliminate positive feedback or guarantee a unique equilibrium. In games with an unbounded, continuous choice space, heterogeneity may either weaken or strengthen positive feedback, depending on a simple convexity/concavity condition. We conclude that positive feedback phenomena derived in representative agent models will often be robust to heterogeneity.Heterogeneity, multiplicity, discrete choice, strategic complementarity, positive feedback