What helps a consumer determine the quantity of something to buy? marginal cost
marginal error
marginal benefit
marginal comparison

marginal cost

Explanation:

"Marginal cost" plays a role when it comes to the quantity that consumers may actually buy for a particular product. If a company decides to produce many bags of good quality at a lower price, the company will be able to save money because over time, they will tend to choose a bulk purchase in which they'll be able to save money. Thus, their marginal cost will decrease. In this case, they can also lower the price for each bag. So, this means that their bags will not be expensive for consumers to buy and the more quantity the consumers will be willing to purchase.

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