This paper sketches a theory of the secular decline in morbidity and mortality that takes account of changes in human physiology since 1700. The synergism between technological and physiological improvements has produced a form of human evolution, much more rapid than natural selection, which is...

This paper is an extensive revision and expansion of Working Paper No.1402. It centers on a new time series of life expectations in the U.S. since 1720, which has been constructed from the NBER/CPE pilot sample of genealogies. Native-born Americans achieved remarkably long life expectations...

This paper uses the data in the NBER/CPE pilot sample of genealogies to create a new time series on life expectation in the U.S. since 1720. After attaining remarkably high levels toward the end of the eighteenth century, life expectation as measured by e0(10) began a decline that lasted about...