1/ First, we can take a look at the number of banks still operating in each District on October 1 1931, about 11 months after the beginning of the crisis. On that day, 132 banks were open in the Eighth District and 119 were open in the Sixth District. However, we need to take into account the fact that the two districts weren't the same initially. This can be seen from the apparent difference in the number of banks operating on May 1, 1990, well before the crisis, with 139 banks open in the Sixth District and 165 banks open in the Eighth. What is the Difference in Differences (DiD) estimate of the effect of lending to troubled banks in terms of the banks open