The Amazon-is-crushing-traditional-retail trade is so ubiquitous that it inspired the creation of two souped-up exchange-traded funds for traders to play with. ProShares on Thursday debuted a short-only ETF that takes dead aim on brick-and-mortar retailers. Its name is dire: The ProShares Decline of the Retail Store ETF. Ticker: EMTY. This is an inverse ETF, meaning that […]