Answer:
Consumers would not keep buying ice cream at $2.75 because after purchasing a certain amount of ice cream, utility would be maximised and consumers would not value ice cream at $2.75 anymore. Consumers would not purchase a product it the marginal utility that would be derived from consuming the product is less than the price.
According to the law of diminishing marginal utility, as more units of a product is increased, total utility increases but at a decreasing rate.
Explanation:
Marginal utitiy is the increase in utility that is derived from consuming one more unit of a product.