Also if one wanted to compare the GDP in 1955 with the GDP in 2005, assuming one can account for the change in the value of the dollar, how would you account for the difference in the components of GDP? For example if most dinner meals were eaten at home in 1955 around a 'family table' and now according to the USDA, more than 50% of meals are eaten away from home... How does one compare GDP when more services, from food service to house cleaning, are contracted with third parties and represented in GDP today than in the past