By Tim McMahon, editor It is extremely difficult to decide how over or under priced a commodity is when the scale we are comparing it to is constantly changing. By adjusting for inflation we can see what is happening to the price much easier. It pays to know what prices are in "Inflation Adjusted Terms".    Once we adjust the gasoline price for inflation we can see that the average price for a gallon of gas since 1918 in June 2010 dollars is $2.39.  So it is easy to tell whether gas is currently "cheap" or "expensive". For instance, the Annual Average gasoline price for 2009 was $2.34, which was extremely close to the long term average price of $2.39. While in 2008 the annual average … [Read more...]