We develop an optimal policy assignment rule that integrates two distinctive approaches commonly used in economics--targeting by observables and targeting through self-selection. Our method can be used with experimental or quasi-experimental data to identify who should be treated, be untreated,...

Economic policies often involve dynamic interventions, where individuals receive repeated interventions over multiple periods. This dynamics makes past responses informative to predict future responses and ultimate outcomes depend on the history of interventions. Despite these phenomena,...

We estimate the long-run Japanese money demand function in a cointegration framework with two nonlinear functional forms that allow for the liquidity trap, and compare the results with the standard log-level functional form. In addition to the conventional linear cointegration techniques, we...