We challenge a common presumption that poison pills and two Delaware case rulings in 1995 validating such pills materially entrench firms. Based on unsolicited takeover attempts from 1985 to 2009, we find that poison pills enhance takeover premiums, but do not reduce completion rates....

We document that the likelihood of asset sales increases with union presence and union wages. Furthermore, acquiring firms gain significant concessions from the incumbent union following asset sales. Finally, the anticipation of union concessions helps explain the excess stock returns around...