J 1

This is a question about the interpretation of coefficients of estimators in a DiD regression model. Please show steps and detailed explanation of the answer. Thank you.

The author estimates another equation, which is as follows. The regression sample only includes families who have an income between 0 - 50 thousand dollars (or 0 - 50k). Yiest = a + Payday Accessat * (Income15 - 50k); + 0Payday Accessat + (Income15 - 50k); + f(Controls) + Cicst The premise underlying this model is that the control group lacks access to payday loans but otherwise provides an appropriate comparison group for the treatment group after controlling for observable differences. If the coefficient B is the difference-in-differences estimator, what is the control group? a. Those with income above 50k b. Those with income above 100k c. Those with income above 15k d. Those with income below 15k