Average prices of 'stuff'. There are at least six ways of working this out. You need to take the mean, median and mode prices and then compare those to the volume of sales.   So taking two cars, a Fiesta at 12,000 and a Bugatti at 1,500,000, gives you a mean price of 756,000 Now take 3 cars, a Fiesta at 12,000, a Bugatti at 1,500,000 and a Scenic at 22,000, mean price is now, 511,333, but the median value is 22,000 Now 5 cars, Fiesta at 12,000, a Bugatti at 1,500,00