Excerpt:
“The hero of the second half of Mr Warsh’s book is Paul Romer, of Stanford University, who took up the challenge ducked by Mr Solow. If technological progress dictates economic growth, what kind of economics governs technological advance? In a series of papers, culminating in an article in the Journal of Political Economy in 1990, Mr Romer tried to make technology “endogenous”, to explain it within the terms of his model. In doing so, he steered growth theory out of the comfortable cul-de-sac in which Mr Solow had so neatly parked it.”

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