Knowledge that Transforms

We study the impact of a public school choice lottery in Charlotte-Mecklenburg schools on college enrollment and degree completion. We find a significant overall increase in college attainment among lottery winners who attend their first choice school. Using rich administrative data on peers, teachers, course offerings and other inputs, we show that the impacts of choice are strongly predicted by gains on several measures of school quality. Gains in attainment are concentrated among girls. Girls respond to attending a better school with higher grades and increases in college-preparatory course-taking, while boys do not.

Every year housing markets in the United Kingdom and the United States experience systematic above-trend increases in prices and transactions during the spring and summer (“hot season”) and below-trend falls during the autumn and winter (“cold season”). House price seasonality poses a challenge to existing housing models. We propose a search-and-matching model with thick-market effects. In thick markets, the quality of matches increases, rising buyers' willingness to pay and sellers' desire to transact. A small, deterministic driver of seasonality can be amplified and revealed as deterministic seasonality in transactions and prices, quantitatively mimicking seasonal fluctuations in UK and US markets.

In January 1995, US President Bill Clinton organized a bailout for Mexico that imposed penalty interest rates and induced the Mexican government to reduce its debt, ending the debt crisis. Can the Troika (European Commission, European Central Bank, and International Monetary Fund) organize similar bailouts for the troubled countries in the eurozone? Our analysis suggests that debt levels are so high that bailouts with penalty interest rates could induce the eurozone governments to default rather than reduce their debt. A resumption of economic growth is one of the few ways that the eurozone crises can end.

We develop a model of households with multiple needs (smoothing shocks, financing investment) and constraints (limited credit, self-control issues) in order to examine the nature of household's financing constraints in a developing country, and the impact of relaxing them. We show that increased access to credit has very different implications for the aggregate model economy depending on its form: asset-financed or cash. We then illustrate how a short-term increase in access to loans leads to very distinct behavior in the short run. The relevance of the model can be evaluated using a field experiment, which we are currently implementing in Uganda.

An increasingly influential 'technological-discontinuity' paradigm suggests that IT-induced technological changes are rapidly raising productivity while making workers redundant. This paper explores the evidence for this view among the IT-using US manufacturing industries. There is some limited support for more rapid productivity growth in IT-intensive industries depending on the exact measures, though not since the late 1990s. Most challenging to this paradigm, and to our expectations, is that output contracts in IT-intensive industries relative to the rest of manufacturing. Productivity increases, when detectable, result from the even faster declines in employment.

The volume of new issuances in secondary loan markets fluctuates over time and falls when collateral values fall. We develop a model with adverse selection and reputation that is consistent with such fluctuations. Adverse selection ensures that the volume of trade falls when collateral values fall. Without reputation, the equilibrium has separation, adverse selection is quickly resolved, and trade volume is independent of collateral value. With reputation, the equilibrium has pooling and adverse selection persists over time. The equilibrium is efficient unless collateral values are low and originators' reputational levels are low. We describe policies that can implement efficient outcomes.

Demichelis and Weibull (2008) show that adding lexicographic lying costs to coordination games with cheap talk yields a sharp prediction: only the efficient outcome is evolutionarily stable. I show that this result is caused by the discontinuity of preferences rather than by small lying costs per se. Finally, I discuss why discontinuity may not be an appealing assumption in evolutionary models.

Beaudry and Portier (2006) propose an identification scheme to study the effects of news shocks about future productivity in vector error correction models (VECMs). This comment shows that, when applied to their VECMs with more than two variables, the identification scheme does not have a unique solution. The problem arises from a particular interplay of cointegration assumptions and long-run restrictions.

The data in Fehr and Tyran (2001) and Petersen and Winn (2014) show that money illusion plays an important role in nominal price adjustment after a fully anticipated negative monetary shock. Money illusion affects subjects' expectations, and causes pronounced nominal inertia after a negative shock but much less inertia after a positive shock. Thus Petersen and Winn (2014) provide a misleading interpretation of both our and their own data.

This paper analyzes long-term effects of skilled-worker immigration on productivity for the Huguenot migration to Prussia. In 1685, religiously persecuted French Huguenots settled in Brandenburg-Prussia and compensated for population losses due to plagues during the Thirty Years’ War. We combine Huguenot immigration lists from 1700 with Prussian firm-level data on the value of inputs and outputs in 1802 in a unique database to analyze the effects of skilled immigration to places with underused economic potential. Exploiting this settlement pattern in an instrumental-variable approach, we find substantial long-term effects of Huguenot settlement on the productivity of textile manufactories.