Knowledge that Transforms

Many of the facts about the extensive margin of trade—which firms export, and how many products are sent to how many destinations— are consistent with a surprisingly large class of trade models because of the sparse nature of trade data. We propose a statistical model to account for sparsity, formalizing the assignment of trade shipments to country, product, and firm categories as balls falling into bins. The balls-and-bins model quantitatively reproduces the pattern of zero product- and firm-level trade flows across export destinations, and the frequency of multiproduct, multidestination exporters. In contrast, balls-and-bins overpredicts the fraction of exporting firms.

Chang and Kim (2007) develop an incomplete asset markets model incorporating discrete labor supply and idiosyncratic labor productivity. Their results resolve long-standing puzzles for business cycle models. Specifically, they produce a low correlation between aggregate hours worked and labor productivity (0.23) and a labor wedge with 76 percent the volatility of output. I show that these results arise from errors in their computational method. I resolve their model using a corrected method and find a strong, positive correlation between hours and productivity (0.80). Fluctuations in the labor wedge decrease to 24 percent of those in output.

This paper reports on recent research showing that the severe recession of 2007-2009 and the weak recovery have been due to poor economic policies and the failure to implement good policies during the past decade. Monetary policy, fiscal policy, and regulatory policy became more discretionary, more interventionist, and less predictable in comparison with the previous two decades of better economic performance. At best these policies led to growth spurts, but were followed by retrenchments, averaging to poor performance. The paper also considers alternative views-that the equilibrium interest rate declined during the decade and that the seriousness of financial crisis caused the slow recovery.

Intangible capital which relies on essential human inputs, or 'organization capital,' presents a unique challenge for measurement. Organization capital cannot be fully owned by firms' financiers, because it is partly embodied in key labor inputs. Instead, cash flows must be shared with key talent and thus neither book nor market values will fully capture its value. Measurement of organization capital requires a model featuring these unique property rights. We use accounting data along with a simple example of such a model to measure the fraction of the US capital stock which is missing from book and market values.

We investigate whether homeowners respond strategically to news of mortgage modification programs. We exploit plausibly exogenous variation in modification policy induced by settlement of US state government lawsuits against Countrywide Financial Corporation, which agreed to offer modifications to seriously delinquent borrowers. Using a difference-in-differences framework, we find that Countrywide's monthly delinquency rate increased more than 0.54 percentage points—a 10 percent relative increase—immediately after the settlement's announcement. The estimated increase in default rates is largest among borrowers least likely to default otherwise. These results suggest that strategic behavior should be an important consideration in designing mortgage modification programs.

Some researchers have argued that anchoring in economic valuations casts doubt on the assumption of consistent and stable preferences. We present new evidence that explores the strength of certain anchoring results. We then present a theoretical framework that provides insights into why we should be cautious of initial empirical findings in general. The model importantly highlights that the rate of false positives depends not only on the observed significance level, but also on statistical power, research priors, and the number of scholars exploring the question. Importantly, a few independent replications dramatically increase the chances that the original finding is true.

We estimate how durable expenditures respond to government spending shocks at different points in the business cycle using a nonlinear VAR approach that allows for the durable multiplier to vary smoothly with the state of the economy. We find strong evidence that the aggregate durable spending response to fiscal shocks is substantially larger during expansions than during recessions, in contrast to what has been has been observed for the aggregate multiplier. We argue that these results are consistent with the theoretical predictions of the fixed cost model of durable demand in Berger and Vavra (2012).

We examine the relationship between concentration and price dispersion using variation induced by a merger in the Canadian mortgage market. Since interest rates are determined through a search and negotiation process, consolidation weakens consumers' bargaining positions. We use reduced-form techniques to estimate the mergers' distributional impact, and show that competition benefits only consumers at the bottom and middle of the transaction price distribution, and that mergers reduce the dispersion of prices. We illustrate that these effects can be explained by the presence of search frictions, and that the average effect of mergers on rates underestimates the increase in market power.

This paper proposes foundations and a methodology for survey-based tracking of well-being. First, we develop a theory in which utility depends on "fundamental aspects" of well-being, measurable with surveys. Second, drawing from psychologists, philosophers, and economists, we compile a comprehensive list of such aspects. Third, we demonstrate our proposed method for estimating the aspects' relative marginal utilities-a necessary input for constructing an individual-level well-being index-by asking ~4,600 U.S. survey respondents to state their preference between pairs of aspect bundles. We estimate high relative marginal utilities for aspects related to family, health, security, values, freedom, happiness, and life satisfaction.

In 2008, a group of uninsured low-income adults in Oregon was selected by lottery for the chance to apply for Medicaid. Using this randomized design and 2009 administrative data, we find no significant effect of Medicaid on employment or earnings. Our 95 percent confidence intervals allow us to reject that Medicaid causes a decline in employment of more than 4.4 percentage points, or an increase of more than 1.2 percentage points. Medicaid increases food stamps receipt, but has little, if any, impact on receipt of other measured government benefits, including SSDI.