An assimilation bias occurs when people’s evaluative judgment is positively influenced by a previously observed signal. We study this effect by examining investors’ appraisal of M&A deals announced 1 day after other firms in the same 1-digit SIC as the merging parties release earnings surprises. Consistent with assimilation effects, acquirers’ M&A announcement stock return initially correlates with the previous day’s earnings surprises. This effect reverses after 1 week. Assimilation generates other distortions as more positive surprises are related to increases in bid competition, takeover premiums, and withdrawn M&As. Evidence from IPOs corroborates the presence of assimilation effects in financial markets.

In acquisitions, target chief executive officers (CEOs) face a moral hazard: Any personal gain from the deal could be offset by the loss of the future compensation stream associated with their jobs. Larger, more important parachutes provide greater relief for these losses. To explicitly measure the moral hazard target CEOs face, we standardize the parachute payment by the expected value of their acquisition-induced lost compensation. We examine 851 acquisitions from 1999–2007, finding that more important parachutes benefit target shareholders through higher completion probabilities. Conversely, as parachute importance increases, target shareholders receive lower takeover premia, while acquirer shareholders capture additional rents from target shareholders.

Antitakeover measures are controversial because the evidence of their net effect on shareholders is mixed. We propose that, for many firms, the potential bonding benefits outweigh the agency costs of the quiet life, explaining the mixed results. We study business combination and poison pill laws as exogenous shocks to takeover vulnerability and use shareholder valuation of internal slack as an indicator of the net effect of takeover protection. Firms susceptible to quiet life agency problems exhibit a decrease in the market-assessed value of internal slack. Conversely, cash appreciates at companies where takeover protection bonds commitments with major counterparties.