Bank X proposed to merge with Bank Y. The Justice Department opposed the merger claiming that the relevant geographic market was the four-country area around Philadelphia in which most of both bank’s customers reside. If the merger was permitted, the merged firms would control 30% of the commercial banking in the four-county area. The two banks contended that the “greater part of the Northeastern U.S.” was the geographic market and that since the merged firms would have less than 5% of the total business of this larger market, the effect of the merger would not be to “substantially lessen competition.” What is the relevant market and should the merger be permitted? Explain.