>The industrial revolution was enabled by more efficient agriculture feeing labour to do other work

you're not wrong, but that's not exactly what happened. Agriculture itself was mechanized by the industrial revolution, affordable tractors (tillers, farrowers, etc.) and harvesters. mechanized railroads put more perishable agricultural goods "closer" to urban areas, etc.

if you look at the growth industry before that, it was mercantilist overseas trade.