Loukas Karabarbounis is a consultant at the Federal Reserve Bank of Minneapolis, an associate professor of economics at the University of Minnesota, a faculty research fellow at the National Bureau of Economic Research, and an associate editor at the Journal of Monetary Economics. He earned a Ph.D. in economics from Harvard University in 2010. He is the recipient of a 2016 Sloan Research Fellowship awarded by the Alfred P. Sloan Foundation.
His latest research focuses on topics such as the global decline of labor’s share of income, productivity and capital flows in South Europe, and cyclical fluctuations in labor markets. His work has been published in academic journals such as the American Economic Journal, the American Economic Review, the Economic Journal, the Journal of Monetary Economics, the Quarterly Journal of Economics, and the Review of Economic Dynamics.
During the past two decades, households experienced increases in their average wages and expenditures alongside with divergent trends in their wages, expenditures, and time allocation. We develop a model with incomplete asset markets and household heterogeneity in market and home technologies and preferences to account for these labor market trends and assess their welfare consequences. Using micro data on expenditures and time use, we identify the sources of heterogeneity across households, document how these sources have changed over time, and perform counterfactual analyses. Given the observed increase in leisure expenditures relative to leisure time and the complementarity of these inputs in leisure technology, we infer a significant increase in the average productivity of time spent on leisure. The increasing productivity of leisure time generates significant welfare gains for the average household and moderates negative welfare effects from the rising dispersion of expenditures and time allocation across households.
The Greek economy experienced a boom until 2007, followed by a prolonged depression resulting in a 25 percent shortfall of GDP by 2016. Informed by a detailed analysis of macroeconomic patterns in Greece, we develop and estimate a rich dynamic general equilibrium model to assess quantitatively the sources of the boom and bust. Lower external demand for traded goods and contractionary fiscal policies account for the largest fraction of the Greek depression. A decline in total factor productivity, due primarily to lower factor utilization, substantially amplifies the depression. Given the significant adjustment of prices and wages observed throughout the cycle, a nominal devaluation would only have short-lived stabilizing effects. By contrast, shifting the burden of adjustment from taxes toward spending or from capital taxes toward other taxes would generate significant longer-term production and consumption gains.
Comparing U.S. GDP to the sum of measured payments to labor and imputed rental payments to capital results in a large and volatile residual or “factorless income.” We analyze three common strategies of allocating and interpreting factorless income, speciﬁcally that it arises from economic proﬁts (Case Π), unmeasured capital (Case K), or deviations of the rental rate of capital from standard measures based on bond returns (Case R). We are skeptical of Case Π as it reveals a tight negative relationship between real interest rates and markups, leads to large ﬂuctuations in inferred factor-augmenting technologies, and results in markups that have risen since the early 1980s but that remain lower today than in the 1960s and 1970s. Case K shows how unmeasured capital plausibly accounts for all factorless income in recent decades, but its value in the 1960s would have to be more than half of the capital stock, which we ﬁnd less plausible. We view Case R as most promising as it leads to more stable factor shares and technology growth than the other cases, though we acknowledge that it requires an explanation for the pattern of deviations from common measures of the rental rate. Using a model with multiple sectors and types of capital, we show that our assessment of the drivers of changes in output, factor shares, and functional inequality depends critically on the interpretation of factorless income.
We revisit the causes, welfare consequences, and policy implications of the dispersion in households’ labor market outcomes using a model with uninsurable risk, incomplete asset markets, and a home production technology. Accounting for home production amplifies welfare-based differences across households meaning that inequality is larger than we thought. Using the optimality condition that households allocate more consumption to their more productive sector, we infer that the dispersion in home productivity across households is roughly three times as large as the dispersion in their wages. There is little scope for home production to offset differences that originate in the market sector because productivity differences in the home sector are large and the time input in home production does not covary with consumption expenditures and wages in the cross section of households. We conclude that the optimal tax system should feature more progressivity taking into account home production.
The sectoral composition of global saving changed dramatically during the last three decades. Whereas in the early 1980s most of global investment was funded by household saving, nowadays nearly two-thirds of global investment is funded by corporate saving. This shift in the sectoral composition of saving was not accompanied by changes in the sectoral composition of investment, implying an improvement in the corporate net lending position. We characterize the behavior of corporate saving using both national income accounts and firm-level data and clarify its relationship with the global decline in labor share, the accumulation of corporate cash stocks, and the greater propensity for equity buybacks. We develop a general equilibrium model with product and capital market imperfections to explore quantitatively the determination of the flow of funds across sectors. Changes including declines in the real interest rate, the price of investment, and corporate income taxes generate increases in corporate profits and shifts in the supply of sectoral saving that are of similar magnitude to those observed in the data.
By how much does an extension of unemployment benefits affect macroeconomic outcomes such as unemployment? Answering this question is challenging because U.S. law extends benefits for states experiencing high unemployment. We use data revisions to decompose the variation in the duration of benefits into the part coming from actual differences in economic conditions and the part coming from measurement error in the real-time data used to determine benefit extensions. Using only the variation coming from measurement error, we find that benefit extensions have a limited influence on state-level macroeconomic outcomes. We use our estimates to quantify the effects of the increase in the duration of benefits during the Great Recession and find that they increased the unemployment rate by at most 0.3 percentage point.
The flow opportunity cost of moving from unemployment to employment consists of foregone public benefits and the foregone value of non-working time in units of consumption. We construct a time series of the opportunity cost of employment using detailed microdata and administrative or national accounts data to estimate benefits, hours per worker, consumption by labor force status, taxes, and preference parameters. Our estimated opportunity cost is procyclical and volatile over the business cycle. The estimated cyclicality implies far less unemployment volatility in many leading models of the labor market than that observed in the data, irrespective of the level of the opportunity cost.
Following the introduction of the euro in 1999, countries in the South experienced large capital inflows and low productivity. We use data for manufacturing firms in Spain to document a significant increase in the dispersion of the return to capital across firms, a stable dispersion of the return to labor across firms, and a significant increase in productivity losses from misallocation over time. We develop a model of heterogenous firms facing financial frictions and investment adjustment costs. The model is consistent with cross-sectional and time-series patterns in size, productivity, capital returns, investment, and debt observed in production and balance sheet data. We illustrate how the decline in the real interest rate, often attributed to the euro convergence process, generates a decline in sectoral total factor productivity as capital inflows are misallocated toward firms that are not necessarily the most productive. We conclude by showing that similar trends in dispersion and productivity losses are observed in Italy and Portugal but not in Germany, France, and Norway.