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Equally it could be argued the large recent above trend area is due in part to the credit growth of the period.Doc
You could argue that the world changed massively after WW1, the Depression and WW2 and the line of regression should be taking after this period. This would show the line rising more rapidly which would hint that the low point of this recession has probably been reached already.
That being said the line does not have to be linear but what would it take to change the growth rate on that scale. Is any specific technological advancement enough or does it require something more profound such as the industrial revolution of the ability to efficiently harness the energy derived from nuclear fusion.
As a side note it's interesting that after WW1 the three major above trend periods have been post severe international conflict/competition (WW1, WW2 and the cold war). Could these have been periods where technological advancements from the military/space exploration filtered into the broader US economy ?