Macroeconomics + Economy 2009 Update 18th Edition by Campbell McConnell, Sean Masaki Flynn,Stanley Brue

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Demand curve D is downsloping because:
A) producers offer less of a product for sale as the price of the product falls.
B) lower prices of a product create income and substitution effects that lead consumers to purchase more of it.
C) the larger the number of buyers in a market, the lower the product price.
D) price and quantity demanded are directly (positively) related.