Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture to 1950.
Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture
Between 1990 and 2000 the growth of the global economy was more than that during 10,000 years, from when agriculture began
The growth of the global economy between 1990 and 2000 exceeds that which had been for 10,000 years from the beginning of agriculture
The growth of the global economy between 1990 and 2000 exceeds what it has been for 10,000 years, from when agriculture began
The growth of the global economy between 1990 and 2000 exceeded what it did for the 10,000 years from the beginning of agriculture
B: Ron:you can't use 'that' in this sort of construction, because constructions using 'that of' (or other preposition after 'that') must have EXACTLY parallel structures. in other words, if the second half says 'that during 10,000 years', then the preceding half must say 'the growth of ___ during something else' (or some other time preposition, such as before or after, in place of during).
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