Typically a percentage of the gross sales price of the property, although some brokers are now offering flat-fee commission structures for minimal services, with add-on fees for additional services selected from a menu of items. It is illegal for any organization or group to establish a standard commission rate, because that would amount to price-fixing. Individual brokers may decline to accept any listing for less than a certain minimum commission level or percentage, though. The average commission for a home sale is in the range of 4 to 7 percent, except that a more difficult property might require a commission as high as 10 percent in order to interest a broker. Commercial, industrial, and farm and land properties typically have higher commissions,but there may be complex formulas for calculating them,rather than a simple percentage of the sale price.