Final answer:
When a firm's acquisition of an input does not involve specialized investments, it can use market exchange without concern for opportunism.
Step-by-step explanation:
In the context of a firm's acquisition of an input, when it does not involve specialized investments, it can use market exchange without concern for opportunism. Market exchange refers to the buying and selling of goods or services in the marketplace, where participants are motivated by self-interest and aim to get more than they give.
This form of exchange is common in capitalist societies and is characterized by quick and easy transactions among strangers.