This paper calculates elasticities of demand for race groups in South Africa, government-revenue-maximizing tax rates, and excess burdens associated with taxes. A change in tax policy can be the political engine of income redistribution with appropriate taxes and subsidies on different commodities. This paper compares both semiparametric and parametric estimators with the censored least absolute deviation and censored maximum likelihood in calculating demand equations and elasticities. It is found that cigarettes and milk are the two commodities that generate the most government revenues from whites per unit of government revenues from blacks.

This paper examines precautionary behavior by relating job-loss risk to household net worth. We use existing best practice and some new strategies to deal with some problematic issues inherent in this literature regarding proxying uncertainty, instrumentation, and incorporating theoretical restrictions. We do not find precautionary variation in the wealth holdings of households with low permanent income, but do find precautionary effects for moderate and higher-income households. When the dependent variable is total net worth, these findings are robust to several alternative specifications. But we do not find precautionary responses in subaggregates of wealth that exclude home equity.

We analyze the effects of trade barriers using highly disaggregated data. The level of disaggregation allows us to separate the effects of tariffs and nontariff barriers (NTBs) into reduction, diversion, and compression effects. We find that multilateral tariffs significantly reduce trade flows and that trade preferences have a significant diverting effect. We also find that higher multilateral tariffs tend to shift trade towards larger exporters, suggesting that the desire to minimize fixed costs associated with trading dominates any preference for variety. In the case of NTBs, we find that, as often as not, the imposition of an NTB leads to an increase in the value of trade; in industries with low import demand elasticities, the influence of rising prices outweighs the decline in quantity.

This paper studies the influence of R&D in the U.S. federal laboratory system, the world's largest, on firm research. Our results are based on a sample of 220 industrial research laboratories that work with a variety of federal laboratories and agencies and are owned by 115 firms in the chemicals, machinery, electrical equipment, and motor vehicles industries. Using an indicator of their importance to R&D managers, we find that cooperative research and development agreements (CRADAs) dominate other channels of technology transfer from federal laboratories to firms. With a CRADA industry laboratories patent more, spend more on company-financed R&D, and devote more resources to their federal counterparts. Without this influence, patenting stays about the same, and only federally funded R&D increases, mostly because of government support. The Stevenson-Wydler Act and amendments during the 1980s introduced CRADAs, which legally bind federal laboratories and firms together in joint research. In theory the agreements could capitalize on complementarities between public and private research. Our results support this perspective and suggest that CRADAs may be more beneficial to firms than other interactions with federal laboratories, precisely because of the mutual effort that they demand from both parties.

We formulate and test a hypothesis for the dramatic restructuring that the plant breeding and seed industry has recently undergone: the reorganization can be explained in part by the desire to exploit complementarities between intellectual assets needed to create genetically modified organisms. This hypothesis is tested using data on agricultural biotechnology patents, notices for field tests of genetically modified organisms, and firm characteristics. The presence of complementarities is identified with a positive covariance in the unexplained variation of asset holdings. Results indicate that coordination of complementary assets has increased under the consolidation of the industry.