Any business,have a certain degree of pricing power,but not the capacity of arbitrary pricing.Because in a free market transaction,the two sides can not,businesses can only be reached through bargaining and customer price acceptable to both sides.If the market's only supplier of ,there will be three kinds of unforeseen circumstances,he:1,gave up the purchase of customer demand disappeared; 2,customers turn to other alternative products; 3,in the absence of access restrictions,potential competitors were profit potential by the temptation of fate came to the same quality at lower prices of goods and customers away.