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producer surplus is the amount a seller is paid for a good minus the seller's cost of providing it. (according to principles of economics 4 edition,144, Mankiw)
the profit is maintained by deducting total cost of that good from selling price.
additionally, the amount a seller is paid for a good is the price.
therefore, i think the problem is about the "cost". if they are the same, then total cost equals to seller's cost of providing it . if not, seller's cost of providing it and total cost is different. i think seller's cost of providing it include opportunity cost.
can someone explain the cost s a little bit?
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