Also, GDP is inaccurate because the CPI is innacurate. compare the CPI with any realistic way of measuring inflation such as case shiller, the big mac index or the price of oil in barrels and you'll quickly see that the CPI is undercounting by a several percentage points per year. she shadowstat: http://www.shadowstats.com/alternate_data/inflation-charts

Also, related, check out Nate Hagens work on the Great simplification (he's got a podcast and on youtube). I won't spoil it here but he and his team of scientists have made some very interesting discoveries on future GDP growth.