Knowledge that Transforms

We report evidence that Bitnet adoption facilitated increased research collaboration between US universities. However, not all institutions benefited equally. Using panel data from seven top engineering journals, Bitnet connection records, and institution ranking data, we find that middle-tier universities were the primary beneficiaries; they benefited largely by increasing their collaboration with top-tier schools. Furthermore, we find that the magnitude of this effect is greatest for co-located pairs. Thus, the advent of Bitnet – and likely of subsequent networks – seems to have increased the role of middle-tier universities as producers of new knowledge in the national innovation system.

We show that even incomplete public insurance can crowd out private insurance demand. We estimate that Medicaid could explain the lack of private long-term care insurance for about two-thirds of the wealth distribution, even if no other factors limited the market's size. Yet Medicaid provides incomplete consumption smoothing for most individuals. Medicaid's crowd-out effect stems from the large implicit tax (about 60–75 percent for a median-wealth individual) that Medicaid imposes on private insurance. An implication is that public policies designed to stimulate the private insurance market will have limited efficacy as long as Medicaid's large implicit tax remains.

This paper studies matching in vertical networks, generalizing the theory of matching in two-sided markets. It gives sufficient conditions for the existence of stable networks and presents an algorithm for finding two of them. One is the best stable network for the agents on the “upstream” end of an industry. The other is best for the agents on the “downstream” end. The paper describes several properties of the set of stable networks and discusses applications of the theory to the design of matching markets with more than two types of agents and to the empirical analysis of supply chains. (JEL C78, D85, L14) The woollen coat, for example, which covers the day-labourer, as coarse and rough as it may appear, is the produce of the joint labour of a great multitude of workmen. The shepherd, the sorter of the wool, the wool-comber or carder, the dyer, the scribbler, the spinner, the weaver, the fuller, the dresser, with many others, must all join their different arts in order to complete even this homely production. —Adam Smith (1776)

African American and White Differences in the Impacts of Monetary Policy on the Duration of Unemployment by William M. Rodgers. Published in volume 98, issue 2, pages 382-86 of American Economic Review, May 2008

We use data from the Current Population Survey collected both before and after Hurricane Katrina to estimate the impact of Katrina on the labor market outcomes of evacuees. Our estimates are based on a difference-in-differences strategy that compares evacuees to all residents of Katrina-affected areas prior to Katrina, with a control group consisting of individuals who originally resided outside the areas affected by the storm. We estimate that Katrina had substantial effects on the labor market outcomes of evacuees over the 13-month period immediately following Katrina. However, our estimates suggest that the effects of Katrina diminished substantially over time as evacuees recovered from the hurricane and adjusted to new economic and social conditions. Evacuees who did not return to their pre-Katrina areas have fared much worse in the labor market than have those who returned. Differences in individual and family characteristics account for some of the differences in outcomes between returnees and non-returnees. We present evidence that non-returnees have fared much worse in the labor market primarily because they came from areas that experienced greater housing damage due to the storm and thus were more likely to have had their lives severely disrupted.

We study the impact of financial constraints on firm size distribution (FSD). We find that financially constrained firms, identified using various proxies, are smaller than the others (their FSD is more skewed to the right). Among OECD countries, however, the FSD of nonconstrained firms virtually overlaps that of the entire sample, suggesting that the overall impact of financial constraints on the FSD is modest. The difference is more pronounced in our sample of firms from non-OECD countries. We conclude that financial constraints cannot be considered the main determinant of the FSD evolution in developed economies.

This paper suggests that the US recovery from the Great Depression was driven by a shift in expectations. This shift was caused by President Franklin Delano Roosevelt's policy actions. On the monetary policy side, Roosevelt abolished the gold standard and—even more importantly—announced the explicit objective of inflating the price level to pre-Depression levels. On the fiscal policy side, Roosevelt expanded real and deficit spending, which made his policy objective credible. These actions violated prevailing policy dogmas and initiated a policy regime change as in Sargent (1983) and Temin and Wigmore (1990). The economic consequences of Roosevelt are evaluated in a dynamic stochastic general equilibrium model with nominal frictions.

We reexamine Alan R. Rogers' (1994) analysis of the biological basis of the rate of time preference. Although his basic insight concerning the derivation of the utility function holds up, the functional form he uses does not generate equilibrium evolutionary behavior. Moreover, Rogers relies upon an interior solution for a particular kind of intergenerational transfer. We show such interior solutions need not generally arise. Hence Rogers most striking prediction, namely that the real interest rate should be about 2 percent per annum, does not follow.

We test whether good economic conditions and expansionary fiscal policy help incumbents get reelected in a large panel of democracies. We find no evidence that deficits help reelection in any group of countries independent of income level, level of democracy, or government or electoral system. In developed countries and old democracies, deficits in election years or over the term of office reduce reelection probabilities. Higher growth rates over the term raise reelection probabilities only in developing countries and new democracies. Low inflation is rewarded by voters only in developed countries. These effects are both statistically significant and quite substantial quantitatively.

The Administrative Foundations of Self-Enforcing Constitutions by Yadira Gonzalez de Lara, Avner Greif and Saumitra Jha. Published in volume 98, issue 2, pages 105-09 of American Economic Review, May 2008