No Tooth Fairies Are Philanthropists

question 408

Multiple Choice

No tooth fairies are philanthropists. Therefore, it is false that all tooth fairies are philanthropists.

• A) Invalid; existential fallacy.
• B) Invalid; illicit contrary.
• C) Valid; no fallacy.
• D) Invalid; illicit contraposition.
• E) Invalid; illicit subalternation.

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Definitions:

Marginal Rate of Substitution

The speed at which a consumer is prepared to exchange one product for a different one while keeping their level of satisfaction constant.

Snails

Slow-moving, gastropod mollusks with a spiral shell, some species of which are eaten as delicacy.

Big Macs

A standard sandwich sold by the international fast-food chain McDonald's, often used as a reference in comparing purchasing power between countries.

Perfect Substitutes

Products that serve as substitutes for each other without diminishing the satisfaction of the user.