How Has the Earth's Population Changed in the Past Fifty

question 109

Multiple Choice

How has the earth's population changed in the past fifty years?

• A) It has shrunk slightly.
• B) It peaked around 25 years ago and has been shrinking ever since.
• C) It has increased by around 25 percent.
• D) It has more than tripled.
• E) It has seriously decreased.

---

Definitions:

X and Y

Often used in economic models to represent variables, products, or factors that can influence outcomes in analyses.

Consuming

The act of using up goods and services to satisfy wants or needs.

Maximizing Utility

The process of choosing the allocation of scarce resources that provides the highest possible satisfaction or happiness to an individual or society.

Marginal Utility

The change in overall satisfaction or utility obtained by consuming one additional unit of a good or service.