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Why does a dichotomy exists in the theory explaining the growth dynamics before and after the industrial revolution?

is there any formula to estimate trend growth rate. in what way it differs from compound average growth rate or exponential growth rate ? 

Neoclassical growth theories suffered a major blow following the Cambridge Capital Controversies and fell out of favour in the 1970s and 1980s. What resuscitated interest among neoclassical theorists in the light of the Cambridge Capital Controversies?

HRV=Hausmann, Rodrik and Velasco

Urgent

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I study the relationship between population growth and economic development I have 6 quantitative variables ( 4 variables whose distribution is normal and two that are not normal) I tried the logarithm application but there are negative numbers What should I do?

Economic growth, public spending, econometrics, theory.

I need a theoretical framework for my master thesis, I will later concentrate on access and equity problems, but firstly I need to explain the causes of informal payments during the communist regime.

Interesting relationships/connections among population growth/migration, number of jobs created, wage growth, economic growth and comparisons among countries etc.