Just a day after Bloomberg reported that Amazon had expressed interest in acquiring communication tool Slack at a valuation of $9 billion or more, the etailer itself has announced a larger and more profound actual acquisition: They are buying Whole Foods Market, for cash, in a transaction valued at approximately $13.7 billion agreement, paying $42 per share. The deal is expected to close in the second half of the year. (Amazon is reported have over $21.5 billion in cash on their balance sheet as of earlier this year. There were rumors last year that the etailer was looking at buying WFM.) […]