Marginal Thinking: Understanding the Costs and Benefits of One More Unit

D. measuring all the costs of a meal against all its benefits when deciding on whether to order a second milkshake.

Marginal thinking refers to considering the costs and benefits of consuming or producing one additional unit of a good or service. It involves analyzing the incremental costs and benefits associated with a decision. In this case, measuring all the costs of a meal against all its benefits when deciding on whether to order a second milkshake demonstrates marginal thinking. It involves evaluating the additional satisfaction gained from consuming an extra milkshake compared to the cost incurred, such as the price of the milkshake and the potential negative effects on health or budget.