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Was exchange an early agent of human evolution or is it merely an artefact of modern civilisation? Spanning two million years of human evolution, this book explores the impact of economics on human evolution and natural history. The theory of evolution by natural selection has always relied in part on progress in areas of science outside biology. By applying economic principles at the borderlines of biology, Haim Ofek shows how some of the outstanding issues in human evolution, such as the increase in human brain size and the expansion of the environmental niche humans occupied, can be answered. He identifies distinct economic forces at work, beginning with the transition from the feed-as-you-go strategy of primates, through hunter-gathering and the domestication of fire to the development of agriculture. This highly readable book will inform and intrigue general readers and those in fields such as evolutionary biology and psychology, economics, and anthropology.

The authors attempt to determine the net effect of city size on quality of life by developing a welfare measure of urbanization. "The estimation procedure suggested in the theoretical part of the paper (section II) is implemented in the empirical part (section III) using 1980 census data from the [U.S.] PUMS (Public Use Micro Data Sample). The results indicate there is no single optimal city size, but rather a worst city size, and about 90 percent of the U.S. population reside in cities smaller than worst city size. If quality of life is related to the degree of urbanization, then long-term trends in the locational distribution of the population should be accounted for in any welfare-oriented measure of national income. One application of our results is, as indicated, the derivation of a GNP welfare deflator reflecting changes in the degree of urbanization (section IV). The findings suggest an urban deflator on the order of six to seven percentage points, which is steadily increasing at a rate of about half a percentage point per decade."

The quantitative effects and even the existence of "human capital depreciation" phenomena has been a subject of controversy in the recent literature. Prior work, however, was largely cross-sectional and the iotgitudina1 dimension, if any, was retrospective. Using longitudinal panel data (on married women in NLS) we have now established that real wages at reentry are, indeed, lower than. at the point of labor force withdrawal, and the decline in wages is bigger the longer the interruption. Pnother striking finding is a relatively rapid growth in wages after the return to worh. This rapid growth appears to reflect the restoration (or "repair") of previously eroded human capital. The phenomenon of "dep-reciation" and "restoration" is also visible in data for immigrants to the United States. However, while immigrants eventually catch up with and often surpass natives, returnees from the non-market never fully restore their earnings potential.

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