Earlier quoted context omitted.
Also, infrastructure does not lead to economic growth. Quite the other way around, really.
It's a sliding scale of return. If your infrastructure is already decent, you will see a terrible return on your investment, as in the case of Japan's debacle of decades of infrastructure investment that produced negative real growth (due to the debt vs growth generated). If you're China in 1980 or 1990 (ie third world infrastructure), vast infrastructure spend will faciliate your decades-long growth explosion. Witho…
(See also: Stalinist industrialization. It was easier for central planners to focus on the hypothetical exponential impacts of "building machine tools to build machine tools", or to focus on building as many T-34 tanks as possible, than to actually design a self-sufficient war economy, which they never really had--there was a very strong reliance on imports of Allied food, radios, and other small goods.)