This article tests the implications of the general human capital that (i) at the individual level, there is a negative relationship between the initial wage level and wage growth of inexperienced workers and (ii) at the market level, the ratio of the present values of wage profiles of investors and otherwise identical noninvestors equals one. We find a negative relationship between initial wage levels and wage growth, even after correcting for negative biases in existing estimates of this relationship. We also find that the ratio of the present values of rising wage profiles to flat wage profiles is generally close to one.

We examine evidence on omitted-ability bias in estimates of the economic return to schooling, using proxies for unobserved ability. We consider measurement error in these ability proxies and the potential endogeneity of both experience and schooling, and examine wages at labor market entry and later. Including ability proxies reduces the estimate of the return to schooling, and instrumenting for these proxies reduces the estimated return still further. Instrumenting for schooling leads to considerably higher estimates of the return to schooling, although only for wages at labor market entry. This estimated return generally reverts to being near (although still above) the OLS estimate if we allow experience to be endogenous. In contrast, for observations at least a few years after labor market entry, the evidence indicates that OLS estimates of the return to schooling that ignore omitted ability are, if anything, biased upward rather than downward.

Hostile takeovers may reduce the prevalence of long-term employment contracts if they facilitate the opportunistic expropriation of extramarginal wage payments. Our tests of two versions of the expropriation hypothesis improve on existing research by using firm- and establishment-level data from an employer salary survey, and by performing both ex ante and ex post tests. First, we study the relationship between proxies for extramarginal wage payments and subsequent hostile takeover activity, and find little evidence of an expropriation motive. Then. since we observe wage and employment structures both before and after takeovers. we investigate whether proxies for extramarginal wages drop after hostile takeovers. The ex post experiments provide evidence consistent with one version of the expropriation hypothesis. In particular, such takeovers appear to reduce extramarginal wage payments to more-tenured workers, mostly through flattening wage-seniority profiles in firms with relatively senior work forces.