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Morton Sloan feels besieged. Over the last several years, the Bronx-based entrepreneur has watched the property taxes on the ten Morton Williams supermarkets he runs in the city swell by hundreds of thousands of dollars. Increasingly aggressive city inspectors now linger in those stores for hours, writing costly citations for items that clerks accidentally mislabel. Some of Sloan’s suppliers say they’ll no longer deliver to New York City because of the Department of Transportation’s frequent parking-ticket blitzes. It gets worse: a new Bloomberg-administration program that encourages fruit and vegetable vendors to set up on street corners has left him scrambling to match prices with competitors who don’t have to pay rent, utilities, payroll taxes, and various other...