Assess graduate students' ability to apply difference-in-differences (DiD) and instrumental variable (IV) techniques with panel data to estimate the causal impact of minimum wage increases on employment; the quiz should test specification of DiD and IV models with fixed effects, articulation and testing of identification assumptions (parallel trends, instrument relevance and exclusion), handling of staggered timing and dynamic effects, appropriate clustering and inference, interpretation of coefficients (including LATE), and design and evaluation of robustness and falsification checks.