What fundamental change did the efficiency of Watt's engine allow for concerning factory locations?

Answer

Factories could be built near labor pools or raw materials elsewhere, away from specific coalfields

Because Watt's engine drastically lowered fuel dependency and operational costs, factories were no longer geographically restricted to cheap coal sources, allowing them to centralize near labor pools.

What fundamental change did the efficiency of Watt's engine allow for concerning factory locations?
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