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2.2 The Marginal Principle

Economics is concerned with making choices. We will assume that the relevant choice is whether to change a current activity level by a little bit. That is, do we hire one more worker? Produce one more unit of output? Purchase one more slice of pizza? This is what is known as a marginal change. To make a good decision, we compare the marginal benefit, the additional benefit resulting from a small increase in some activity, with the marginal cost, the additional cost resulting from a small increase in some activity. If the marginal benefit is greater than the marginal cost, we want to increase the level of the activity. Doing so will increase our total well-being by the difference between the marginal benefit and the marginal cost. If the marginal benefit is less than the marginal cost, we want to reduce the level of the activity. If they are equal, we are at the optimal amount of the activity.

A marginal change refers to a small change in some activity. You can think of a marginal change as taking the next step in a logical sequence. You would never, for instance, compare the salary of someone with a Ph.D. against someone who didn’t finish high school. Why not? These aren’t two logical options. A person doesn’t decide to either earn a Ph.D. or drop out of high school. She decides whether to drop out of high school or get a high school diploma. She next decides whether to go to college or not. Upon graduating college she decides whether to take a job or go to graduate school. These are each sequential steps, and thus we can make relevant comparisons between them. A person will continue to go to school as long as the marginal benefit of the next level of schooling exceeds the marginal cost.

Let’s review two Applications that answer key questions we posed at the start of the chapter:
What are society’s tradeoffs between different goods?

APPLICATION 2: THE OPPORTUNITY COST OF MILITARY SPENDING
If society has a fixed amount of money to spend on goods and services, buying one type of good or service means we sacrifice the opportunity to buy others. In this example, $100 billion can pay for the war in Iraq or 13 million children enrolled in Head Start programs. To see this idea in another way, suppose that your state legislature, in an attempt to make college more affordable, gives each full-time college student $500 to offset the cost of textbooks. The state now has less money to spend on the other goods and services the state provides, such as police patrols and highway maintenance. So, the true cost of the $500 per student may be that fewer potholes are repaired on state highways.

How do firms think at the margin?

APPLICATION 3:
THE MARGINAL BENEFIT AND MARGINAL COST OF SPEED
This Application considers whether a driver should drive faster than their current speed. The marginal benefit of driving 1 mile per hour faster is that you will arrive at your destination more quickly. The marginal cost is the increased likelihood of injuries and accidents, not to mention speeding tickets. If the marginal benefit exceeds the marginal cost, a driver should speed up.

The Application also highlights unintended outcomes of auto safety equipment. If the marginal cost of driving faster is reduced by increased safety equipment, rational drivers will increase their speed, which may lead to an undesirable result for bicyclists on the road

A restaurant might use the marginal principle when deciding whether to open for breakfast in addition to lunch. Since many of the costs of the restaurant (rent, payments for equipment) are fixed, the only additional cost of opening for breakfast would be the food, labor, and utilities needed to open earlier. If the revenue from selling breakfast exceeds these costs, the restaurant should open for breakfast.

Study Tip
Decision making based on the marginal principle is the basis for all decisions in this book. Be sure you understand the concepts of marginal benefit and marginal cost. Recognize that people should continue to take an action as long as the marginal benefit is greater than the marginal cost.

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