B) Propose a cross-sectional estimator for the impact of the minimum wage hike: - Provide the symbolic formula for the estimator as well as the numerical estimate. Provide a brief description of the estimator. - Discuss the key assumption required for the estimator to be valid (no bias) - Discuss a scenario under which each assumption would be violated (bias). C) Propose a difference-in-differences estimator for the impact of the minimum wage hike: - Provide the symbolic formula for the estimator as well as the numerical estimate. Provide a brief description of the estimator. - Discuss the key assumption required for the estimator to be valid (no bias) - Discuss a scenario under which each assumption would be violated (bias). 2