Knowledge that Transforms

In this paper I revisit the interpretation of the linear instrumental variables (IV) estimand as a weighted average of conditional local average treatment effects (LATEs). I focus on a situation in which additional covariates are required for identification while the reduced-form and first-stage regressions may be misspecified due to an implicit homogeneity restriction on the effects of the instrument. I show that the weights on some conditional LATEs are negative and the IV estimand is no longer interpretable as a causal effect under a weaker version of monotonicity, i.e. when there are compliers but no defiers at some covariate values and defiers but no compliers elsewhere. The problem of negative weights disappears in the interacted specification of Angrist and Imbens (I1995), which avoids misspecification and seems to be underused in applied work. I illustrate my findings in an application to the causal effects of pretrial detention on case outcomes. In this setting, I reject the stronger version of monotonicity, demonstrate that the interacted instruments are sufficiently strong for consistent estimation using the jackknife methodology, and present several estimates that are economically and statistically different, depending on whether the interacted instruments are used.

We examine how different forms of government intervention - explicit deposit insurance, implicit guarantees from nationalization, and assurance effects from re-privatization - shape depositor behavior during a banking crisis. Using proprietary monthly account-level data, we show that depositors respond to formal insurance limits even in an environment of broad state support, but adjust only partially. Stabilization is markedly stronger after the takeover by a financially strong private bank than during state ownership, despite unchanged statutory coverage. These patterns are inconsistent with a strong bailout-expectations view in which explicit insurance is largely irrelevant and instead point to credibility as a key determinant of depositor behavior. We further show that political trust amplifies the effectiveness of government guarantees. Overall, our findings highlight that the form and credibility of government backstops, rather than coverage levels alone, are central to retail deposit funding stability during crises.

An asset owner designs an asset-backed security and a signal about its value. After experiencing a liquidity shock and privately observing the signal, he sells the security to imperfectly competitive buyers. With flexible information design, the security’s informational sensitivity is a blessing, not a curse. Among double-monotone securities, the issuer prefers to sell the asset in combination with an appropriate signal rather than design more complex securities. Within the class of monotone securities, live-or-die securities are optimal and strictly dominate asset sales. When signals are restricted to be sufficiently informative about the upside, debt and additional-tier-1 debt become optimal.