Despite huge stock in the country, the rates of sugar in wholesale market have increased by around Rs500 per 50kg during the last week due to limited sugar supply from the mills. As a result, the prices in retail market have jumped by Rs5 to Rs60 per kg from earlier rate of Rs55 per kg. Presently, no shopkeeper is following the official rate of sugar to sell the commodity at Rs55 per kg with some of the retailers refusing to sell white sweetener. The rates have surged because the mills had put an unannounced ban on supply in protest against the government for not allowing export of sugar. He said that the dealers could not lift sugar from the mills despite an upward surge in its prices.