Professor LoPucki’s APR issue might not be two-cycle billing as many of the commentators think. Just as likely, it is residual interest (a/k/a trailing interest), the often ignored, but just as potent cousin of double-cycle billing.
Residual interest has not gotten nearly as much attention as it should (and it is often confused with double-cycle billing). Residual interest is a nasty billing trap that drains away discretionary income (also known as potential savings) from American consumers, and should be at the top of the Congressional hit list for predatory credit card billing practices.