Trading up and the Skill Premium
Nir Jaimovich, University of Zurich
Sergio Rebelo, Northwestern University and NBER
Arlene Wong, Princeton University and NBER
Miao Ben Zhang, University of Southern California
Daron Acemoglu, Massachusetts Institute of Technology and NBER
Jonathan Vogel, University of California, Los Angeles and NBER

Jaimovich, Rebelo, Wong, and Zhang study the role that increases in the quality of the goods consumed ("trading up") might have played in the rise of the skill premium that occurred in the last four decades. Their empirical work shows that high-quality goods are more intensive in skilled labor than low-quality goods and that household spending on high-quality goods rises with income. The researchers propose a model consistent with these facts and argue that it accounts for the observed rise in the skill premium with more plausible rates of skill-biased technical change than those required by the canonical model.


In addition to the conference paper, the research was distributed as NBER Working Paper w25931, which may be a more recent version.

The Lost Ones: The Opportunities and Outcomes of Non-College Educated Americans Born in the 1960s
Margherita Borella, Universita di Torino
Mariacristina De Nardi, University of Minnesota and NBER
Fang Yang, Louisiana State University
Richard Blundell, University College London and IFS
Greg Kaplan, University of Chicago and NBER

White, non-college-educated Americans born in the 1960s face shorter life expectancies, higher medical expenses, and lower wages per unit of human capital compared with those born in the 1940s, and men's wages declined more than women's. After documenting these changes, Borella, De Nardi, and Yang use a life-cycle model of couples and singles to evaluate their effects. The drop in wages depressed the labor supply of men and increased that of women, especially in married couples. Their shorter life expectancy reduced their retirement savings but the increase in out-of-pocket medical expenses increased them by more. Welfare losses, measured a one-time asset compensation are 12.5%, 8%, and 7.2% of the present discounted value of earnings for single men, couples, and single women, respectively. Lower wages explain 47-58% of these losses, shorter life expectancies 25-34%, and higher medical expenses account for the rest.

Explaining the Rising Concentration of U.S. Industries: Superstars, Intangibles, Globalization or Market Power?
Matias Covarrubias, New York University
Germán Gutiérrez, New York University
Thomas Philippon, New York University and NBER
Janice Eberly, Northwestern University and NBER
Chad Syverson, University of Chicago and NBER

Since the late 1990's, U.S. industries have become more concentrated and more profitable, while non residential business investment has been weak relative to fundamentals. The interpretation of these trends is controversial. Philippon and Gutiérrez develop a simple model to differentiate four prominent explanations: decreasing domestic competition (DDC), increases in the efficient scale of operation (EFS), the rise of intangible assets (INTAN), and globalization (GLOBAL). They use their model along with case studies for clear superstars (GAFAM) to assess the validity of common proxies for each hypothesis, including measures of concentration, profitability, mark-ups, investment and productivity divergence between laggard and frontier firms. The researchers highlight that some widely used measures of mark-ups and productivity divergence are prone to measurement error, and therefore provide misleading evidence on aggregate trends. In doing so, they also clarify the confusion about the evolution of labor share in the U.S. and in Europe.

On the Empirical (Ir)Relevance of the Zero Lower Bound Constraint
Davide Debortoli, Universitat Pompeu Fabra
Jordi Galí, CREI and NBER
Luca Gambetti, Universitat Autonoma de Barcelona
Ben Bernanke, Brookings Institution
Mark Watson, Princeton University and NBER

The zero lower bound (ZLB) irrelevance hypothesis implies that the economy's performance is not affected by a binding ZLB constraint. Debortoli, Galí, and Gambetti evaluate that hypothesis for the recent ZLB episode experienced by the U.S. economy (2009Q1-2015Q4). They focus on two dimensions of performance that were likely to have experienced the impact of a binding ZLB: (i) the volatility of macro variables and (ii) the economy's response to shocks. Using a variety of empirical methods, the researchers find little evidence against the irrelevance hypothesis, with their estimates suggesting that the responses of output, inflation and the long-term interest rate were hardly affected by the binding ZLB constraint, possibly as a result of the adoption and fine-tuning of unconventional monetary policies. The researchers can reconcile their empirical findings with the predictions of a simple New Keynesian model under the assumption of a shadow interest rate rule.


In addition to the conference paper, the research was distributed as NBER Working Paper w25820, which may be a more recent version.

Optimal Inflation and the Identification of the Phillips Curve
Michael McLeay, Bank of England
Silvana Tenreyro, London School of Economics
Marc Giannoni, Federal Reserve Bank of Dallas
Matthew Rognlie, Northwestern University and NBER

Several academics and practitioners have pointed out that inflation follows a seemingly exogenous statistical process, unrelated to the output gap, leading some to argue that the Phillips curve has weakened or disappeared. McLeay and Tenreyro explain why this seemingly exogenous process arises, or, in other words, why it is difficult to empirically identify a Phillips curve, a key building block of the policy framework used by central banks. They show why this result need not imply that the Phillips curve does not hold -- on the contrary, their conceptual framework is built under the assumption that the Phillips curve always holds. The reason is simple: If monetary policy is set with the goal of minimizing welfare losses (measured as the sum of deviations of inflation from its target and output from its potential), subject to a Phillips curve, a central bank will seek to increase inflation when output is below potential. This targeting rule will impart a negative correlation between inflation and the output gap, blurring the identification of the (positively sloped) Phillips curve. The researchers discuss different strategies to circumvent the identification problem and present evidence of a robust Phillips curve in U.S. data.

In addition to the conference paper, the research was distributed as NBER Working Paper w25892, which may be a more recent version.

Special Deals with Chinese Characteristics
Chong-En Bai, Tsinghua University
Chang-Tai Hsieh, University of Chicago and NBER
Zheng Michael Song, Chinese University of Hong Kong
Maurice Obstfeld, University of California, Berkeley and NBER
Antoinette Schoar, Massachusetts Institute of Technology and NBER

Chinese local governments wield their enormous political power and administrative capacity to provide "special deals" for favored private firms. Bai, Hsieh, and Song argue that China's extraordinary economic growth comes from these special deals. Local political leaders do so because they derive personal benefits, either political or monetary, from providing special deals. Competition between local governments limits the predatory effects of special deals.


In addition to the conference paper, the research was distributed as NBER Working Paper w25839, which may be a more recent version.


Below is a list of conference attendees.
Elena Afanasyeva, Federal Reserve Board
Riccardo Bianchi Vimercati, Northwestern University
Megan Greene, Manulife Asset Management
Spencer Krane, Federal Reserve Bank of Chicago
Tao Peng, Southwestern University of Finance and Economics
Tomohiro Tsuruga, Bank of Japan
Christopher Waller, Federal Reserve Bank of St. Louis

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