Ivan Will Be Sad If and Only If Any Child

question 26

Multiple Choice

Ivan will be sad if and only if any child is injured.

• A) Si ≡ (∃x)(Cx • Ix)
• B) (x)[(Cx • Ix) ≡ Ix]
• C) (∃x)(Cx • Ix) ⊃ Si
• D) Si ≡ (x)(Cx • Ix)
• E) Si ≡ (x)(Cx ⊃ Ix)

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Definitions:

Marginal Revenue

The financial gain from disposing of one extra unit of a product or service.

Average Revenue

The amount of income generated per unit of sale or the total income divided by the number of units sold.

Purely Competitive Seller

A seller in a market that has many buyers and sellers, with all firms selling identical products and no barriers to entry.

Marginal Revenue

The boost in revenue experienced by a company when it sells an extra unit of its goods or services.