In a Diamond–Dybvig type model of fnancial intermediation, we allow depositors
to announce at a positive cost to subsequent depositors that they keep their funds
deposited in the bank. Theoretically, the mere availability of public announcements
(and not its use) ensures that no bank run is the unique equilibrium outcome. Multiple equilibria—including bank run—exist without such public announcements. We
test the theoretical results in the lab and fnd a widespread use of announcements,
which we interpret as an attempt to coordinate on the no bank run outcome. Withdrawal rates in general are lower in information sets that contain announcement
