Ever since the development of the Autoregressive Conditional Heteroskedasticity (ARCH) model (Engle [1982]), testing for the presence of ARCH has become a routine diagnostic. One popular method of testing for ARCH is T times the R^2 from a regression of squared residuals on p of its lags. This...

This paper asks whether wage subsidies encourages participants to move into jobs with greater wage growth. We provide an analytical framework that identifies the key causal links between earnings subsidies and both within-and between-job wage growth. This framework highlights the importance of...