In this paper we review a number of analytical mothods and issues related to identifying and estimating the source of productivy growth.

Whereas difficulties in measuring the output of service sectors have been well documented, input measures are reasonably accurate. Using U.S. input-output data for the period 1958-87 and a number of indices of skill and occupational change derived from the Dictionary of Occupational Titles and...

We model research as a signal on an unknown parameter of a technology.

This study makes us of the OECD Structural Analysis industrial database (STAN) to investigate patterns of industry specialization as measured by the country's share of total industry production for 14 OECD countries over the period 1970 to 1993. I find that these industrialized countries tended...

This paper formulates a multiproduct structural model to examine the evolution of structure of production and demand and the dynamic interaction between the two in the context of the U.S. telecommunications industry over an extended period, from 1935 to 1987.

The paper offers reasons indicating that the spillovers from innovation activity are surprisingly large; and argues that individuals who have invested directly or indirectly in the economy's innovation processes can be estimated, conservatively, to obtain less than ten percent of the total...

If machines are indivisible, a vintage capital model nust give rise to income inequality. If new machines are always better than old ones and if society cannot provide everyone with a new machine all of the time, inequality will result. I explore this mechanism in detail.

This a one-agent model of learning by doing and technology choice. The more the agent uses a technology, the better he learns its parameters, and the more productive he gets. This expertise is a form of human capital.

We examine the diffusion of more than twenty technologies across twenty-three of the world ’s leading industrial economies. Our evidence covers major technology classes such as textile production, steel manufacture, communications, information technology, transportation, and electricity for...

People at the top of an occupational ladder earn more partly because they have spent time on lower rungs, where they have learned something. But what precisely do they learn? There are two contrasting views: First, the "Bandit" model assumes that people are different, that experience reveals...