How Did John Snow Figure Out the Source of Cholera

question 22

Multiple Choice

How did John Snow figure out the source of cholera in London?

• A) He made a lucky guess.
• B) He asked his patients where they'd gotten it.
• C) He carefully mapped who got sick and who didn't, and determined that all the sick ones were getting water from the same source.
• D) He experimented with turning off certain water sources, and it turned out to prevent the disease.
• E) He examined the feces of the victims and saw the bacteria.

---

Definitions:

Competitive Market

A competitive market is a market structure characterized by a large number of buyers and sellers, where no single entity has the power to influence market prices significantly.

Free-rider Problem

A situation where individuals benefit from resources, goods, or services that they do not pay for, which can lead to underproduction or depletion of those resources.

Rivalry

The competitive relationship between firms in the market, striving to gain advantage over each other in terms of sales, market share, or innovation.

Nonexcludable

A characteristic of a good or service whereby it is not possible to prevent people who have not paid for it from having access to it.