Question

a buyer is willing to pay 9.99 for a product. if the seller is willing to accept that amount, then 9.99 is the
markdown.
exchange price.
value.
demand.

Explanation:

An exchange price is the specific amount agreed upon by both a buyer (who is willing to pay it) and a seller (who is willing to accept it) for a product. A markdown is a reduction from an original price, value is a broader measure of worth, and demand refers to the desire for a product, so none of these match the scenario.

Answer:

B. exchange price.