The author develops a dynamic model of banking competition to determine which capital instrument is most effective in disciplining banks' risk choice. Comparisons are conducted between equity, subordinated debentures (SD), and uninsured deposits (UD) as funding sources. The model, adapted from...

We document five facts about banks: (1) market and book leverage diverged during the 2008 crisis, (2) Tobin's Q predicts future profitability, (3) neither book nor market leverage appears constrained, (4) banks maintain a market-leverage target that is reached slowly, and (5) precrisis, leverage...