#WallStreet loved the look of this: the #PrivateEquity giant KKR took over #DollarGeneral in 2007 and went on a acquisition and expansion bonanza. Even after KKR formally divested itself of Dollar General, the company's hit-man #MichaelMCalbert stayed on the board, rising to chairman.

The dollar store market is a duopoly. Dollar General's rival is #DollarTree, another gelatinous cube of a company that grew by absorbing many of its competitors, using Wall Street's money.

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