Techlogy Differences over Space and Time looks at how countries use their productive resources-such as workers, skills, equipment and structures, and natural resources. Francesco Caselli develops methods to assess the efficiency with which productive inputs are used, and how these efficiencies vary across countries and over time.Caselli finds that richer countries use skilled workers relatively more efficiently than unskilled workers, and equipment and structures relatively more efficiently than natural resources. They also are relatively more efficient users of labor than of capital. Techlogical change tends to make countries particularly efficient at using skills and less efficient at using capital. Technical change also favors experienced workers.In order to interpret and understand these findings, Caselli presents a theory of techlogy choice. In this theory, firms pick techlogies that make the most efficient use of the most abundant production factors when these factors are good substitutes for the less abundant factors. Firms pick techlogies that make the most of less abundant factors when other suitable factors are t available for substitution. For example, rich countries, where skilled workers are abundant, use skilled workers efficiently, as these are good substitutes for unskilled workers. This flexible framework can be applied to other pairs of inputs, over time, and across countries.Techlogy Differences over Space and Time has significant implications t only for the theoretical understanding of development and techlogical invation, but also for government formulation of industrial policy and multinationals making decisions about what to invest in and where to make those investments.
Francesco Caselli is the Norman Sosnow Professor of Economics at the London School of Economics, and a fellow of the British Academy.