This paper provides a human capital theory-based explanation for the presence of a permanent component in earnings levels as well as individual heterogeneity in earnings slopes. We incorporate uncertainty about the future rental rates of human capital into a life-cycle human capital investment...

This paper shows that the Zero-Information-Limit-Condition (ZILC) formulated by Nelson and Startz (2006) holds in the GARCH(1,1) model. As a result, the GARCH estimate tends to have too small a standard error relative to the true one when the ARCH parameter is small, even when sample size...