The costs incurred when a firm buys on the marketplace what it cannot make itself are referred to as

transaction cost

Explanation:

Transaction costs refers to the expenses that are incurred when a good or service is bought or sold. Transaction cost is the labor that's required in bringing a product to the market.

Transaction cost is the costs that are incurred when a firm buys on the marketplace what it cannot make itself.

Transaction costs are the costs that are incurred which don’t accrue to the participant of the transaction.

answers

a. nitrogen (n)

d. oxygen (o)

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