Comment: You'll have to provide a concrete example

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You'll have to provide a concrete example

as I cannot find any.

It would stand to reason that countries that did not use slavery would be the fastest to develop - as the demand for capital goods would foster an environment that would lead to much faster improvement of productivity while the availability of slave labor would reduce the demand for capital goods.

Tractors are much more efficient (and less costly) than slaves, but would tractors be as prevalent if slavery were never abolished?