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but why would production ever increase if not for demand?
Technological advancement and specialization from trade.
More stuff being consumed isn't the same as more demand. Hold a demand curve fixed and slide the supply curve to the right.
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but, there is no reason to advance or specialize unless one expects people to demand what you will produce.
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Profit maximization is the reason. If cheaper inputs can be obtained or a more efficient conversion into outputs is discovered, profits increase and production expands.
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