Comment: If there is enough demand,

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In reply to comment: A lot of simple-minded (see in situ)

If there is enough demand,

If there is enough demand, products do get bought up quickly if underpriced and resold at a higher price. Not every customer buys it at the lowest price, either out of ignorance for some other reason, so if there's enough difference then the reseller will continue buying up a portion of the product to realize the higher market price.

On the other end of the scale, if a manufacturer is charging a huge premium, an entrepreneur can create a start up and charge a moderately large premium instead of a huge premium.