37 Reading: Marginal Analysis
A Little More or a Little Less
The budget constraint framework helps to illustrate that most choices in the real world are not about getting all of one thing or all of another—we rarely decide “all burgers” or “all bus tickets.” Options usually fall somewhere on a continuum, and the choice usually involves marginal decision-making and marginal analysis.
Marginal decision-making means considering a little more or a little less than what we already have. We decide by using marginal analysis, which means comparing the costs and benefits of a little more or a little less.
It’s natural for people to compare costs and benefits, but often we look at total costs and total benefits, when the best choice requires comparing how costs and benefits change from one option to another. In short, you might think of marginal analysis as “change analysis.” Marginal analysis is used throughout economics. This subtle concept is easier to grasp with examples.
Marginal Cost
Generally speaking, marginal cost is the difference (or change) in cost of a different choice. From a consumer’s point of view, marginal cost is the additional cost of one more item purchased. From a business’s point of view, marginal cost is the additional cost of one more item produced.
Suppose you typically spend a week at the beach for vacation, but this year you earned an annual bonus from your job. Should you rent a beach house for one week or two? A one-week rental costs $2,000. A two-week rental costs $3,600. Holding everything else constant, which option is better? If you stay for two weeks, the cost is significantly higher: $3,600 versus $2,000. But consider the cost by week. The first week costs $2,000. The difference in cost between one week and two is $3,600 – $2,000, or $1,600. Thus, while the marginal cost of the first week’s rental is $2,000, the marginal cost of the second week’s rental is $1,600. This illustrates the key rule of marginal analysis: Marginal cost = the change in total cost from one option to another.
Consider another example. Imagine that you’re out getting ice cream with your friends or family. You can choose whether to buy one, two, or three scoops of ice cream. One scoop costs $3.00, two scoops cost $5.00, and three scoops cost $7.00. This information is shown in the following table.
| Scoops of Ice Cream | 1 | 2 | 3 |
| Total Cost | $3 | $5 | $7 |
What is the marginal cost of each scoop of ice cream? The marginal cost of the first scoop of ice cream is $3.00 because you have to pay $3.00 more to get one scoop of ice cream than you do to get zero scoops of ice cream. The marginal cost of the second scoop of ice cream is $2.00 because you only need to pay two more dollars to get two scoops than you need to pay to get one scoop. The marginal cost of the third scoop is also $2.00 because you would need to pay an additional two dollars to get that third scoop.
| Scoops of Ice Cream | 1 | 2 | 3 |
| Marginal Cost | $3 | $2 | $2 |
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