reply to Investopedia also references that "marginal cost is the change in total production cost that comes from making or producing one additional unit (Kenton & Catalano (Reviewer), 2023)." As Luke hears challenges from others that he won't succeed, Luke continues pushing his limits to win the challenge and the money that others will lose betting against him. If Luke had to pay for each egg he had to eat, he would have been more hesitant to even volunteer for the challenge. If he joined the challenge anyway and had to pay for each egg, he would have chosen less quantity of eggs to consume. When Luke's income is impacted, his purchasing power value of money (Miller, 2021) decreases when he actually has to pay for the cost of eggs himself. I get a pair of glasses each year with my vision insurance benefit. The free portion is up to a specified price of $150-200 or more. I choose to pay for the higher plan, which offers more coverage. When the insurance is paying, you would think the options are unlimited. I spend on the higher plan and pay higher premiums to give me more purchasing power and because of