In electing a businessman as mayor, a lot of New Yorkers hoped for a mayor who would govern with business friendly policies. Mr. Bloomberg has had his accomplishments on this front, but he could profit from a conversation with Dong Sup Yang of Brighton Beach, Brooklyn. Mr. Yang was fined $3,000 last year by one police officer who wrote up such violations as “selling cut melons, not storing in ice or below 50 degree F.” A group called the Small Business Congress will appear at City Hall tomorrow to complain about what it calls a regulatory environment that is the worst in more than 20 years. More tickets are being issued to small businesses, and the fines are more costly to the businesses. No one is calling on Mr. Bloomberg to fail to enforce the city’s laws. But the entrepreneur mayor can surely encourage his enforcers, when common sense dictates, to exercise some discretion and restraint.