A downward sloping demand curve tells us
a. the price that will prevail in a market during a given period of time
b. that consumers will buy more of an item when their incomes increase
c. that consumers will buy less of an item when its price rises, ceteris paribus.
d. that consumers will buy less of an item when its price falls, ceteris paribus. e that suppliers will supply more of a product as the quantity demanded increases.