Virginia apparently is going to permit the establishment of gambling casinos and news stories have touted substantial numbers of new jobs, tax collections, economic impacts from the casinos. (a) If we think of the Commonwealth of Virginia as a single unit, under what circumstances will the casinos add jobs, tax collections and economic impact? (b) What does "displacement" have to do with this? (c) Now, shift your attention to the City of Portsmouth, which clearly wishes to open a casino. Explain the circumstances under which Portsmouth will benefit economically from doing so.