While the Vector for Y

question 31

Multiple Choice

While the vector for Y. pestis is the rat flea, which of the following are amplifying hosts that can become ill and therefore play an important link in the transmission to humans?

• A) mice and rats
• B) voles
• C) rabbits and ground squirrels
• D) only a and b are correct

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Definitions:

Marginal Rate

The rate at which something changes with each additional unit, such as the marginal tax rate, which is the rate applied to each additional dollar of income.

Substitution

The economic principle where consumers replace more expensive items with less costly alternatives.

Indifference Curve

A graphical representation of different combinations of two goods or services among which a consumer is indifferent, showing preferences of consumption.

Inferior Good

A type of good for which demand decreases as the income of the consumer increases, opposite to the behavior observed with normal goods.