Shanghai's market regulators uncovered several pricing-regulation violations on Tuesday, part of a crackdown implemented to stabilize the market.Among them, Shanghai Guyuan Agriculture Co was fined 400,000 yuan (US$62,794) for price fraud, the Shanghai Administration for Market Regulation said.Officials said the company misled consumers by claiming its vegetables come directly from its planting base in Fengxian District, while the reality is they were purchased from other vendors.