Most models of dynamic labor demand are written in terms of costs of adjusting employment (net adjustment costs). A few are based on the costs of hiring and firing (gross adjustment costs). This study derives several models containing both types of adjustment costs. A dynamic-programming model...

The theory of the dynamics of labor demand is based either on the costs of adjusting the level of employment or on the costs of hiring or firing (of gross changes in employment). We write down a generalized cost of adjustment function that includes both types of cost and allows for asymmetries...

Toys. The impact of computers on productivity has been examined directly on macro data and indirectly (on wages) using microeconomic data. This study examines the direct impact on the productivity of scholarship by considering how high technology might alter patterns of coauthoring of articles...

I describe and compare sources of data on citations in economics and the statistics that can be constructed from them. Constructing data sets of the post-publication citation histories of articles published in the “Top 5” journals in the 1970s and the 2000s, I examine distributions and life...

Adjusted for many other determinants, beauty affects earnings; but does it lead directly to the differences in productivity that we believe generate earnings differences? We take a large sample of student instructional ratings for a group of university professors, acquire six independent...

We estimate substitution possibilities among a set of age-race-sex groups in the labor force. The estimates are based on cross-section data from SMSAs in 1969,and they allow us to consider how substitutable adult women are for young women or young men. The estimates are used, along with...

Economists' productivity, as measured by publication in leading journals, declines very sharply with age. Additional evidence shows that this is a rational response to economic incentives and/or changing physical or mental abilities: There is no difference by age in the probability that an...

Evidence from Current Population Surveys through 1997, various cohorts of the National Longitudinal Surveys, and the Panel Study of Income Dynamics suggests that the fraction of American employees paid salaries stayed constant from the late 1960s through the late 1970s, but fell slightly...

We take U.S. and Israeli household data on expenditures of time and goods, generate an exhaustive set of commodities that households produce/consume using them, and calculate their relative goods intensities. Leisure activities are uniformly relatively time intensive, health, travel and lodging...

Food Stamps represent nearly $11 billion of personal income in the United States. The coupons that are issued to represent the purchasing power available to recipients are also reserves for the commercial banking system.This study asks how closely these coupons are substitutable for what is...