Suppose Melita is willing to pay a maximum of $30 for a pair of normal sunglasses and $36 for the same pair with a double UV-protection filter. If the unit cost of upgrading a product is $6, the seller will upgrade the product if Melita pays at least $35 for it

If the demand for CD players decreases and the supply of CD players decreases, then

A) it is clear that prices will decrease, the change in the quantity of CD players sold is ambiguous. B) it is clear that prices will increase, the change in the quantity of CD players sold is ambiguous. C) it is clear that quantity sold will decrease, the change in the price of CD players is ambiguous. D) it is clear that change in quantity sold is ambiguous, the change in the price of CD players is ambiguous.

On the eve of the Civil War, which U.S. region had the highest per capita income?

a. the Northeast region b. the South Atlantic region c. the North Central region d. the West South Central region