This company generates revenue even when the economy is unfavorable.Not even the best businesses can make money hand over fist every year. But the really good ones figure out a way to make a profit -- and to take care of their shareholders -- even during challenging times. In Louisiana, Pool Corp. (POOL 0.09%) is one of those. It's keeping the money flowing.Pool Corp. isn't a flashy stock, but it has a great mix of consistency, cash flow, and good management. It's a favored stock of many income investors, i ...