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ndomized Controlled Trials (RCTs): The gold standard, where random assignment ensures treatment exogeneity. Natural Experiments: Exploiting external events or policy changes that approximate random assignment. Instrumental Variables (IV): Using instruments to address endog

explores the core concepts of Mostly Harmless Econometrics , highlights its significance in empirical research, and discusses how it equips empiricists with the tools necessary to produce reliable and transparent results. The Foundations of Empirical Econometrics Under