When we move along a given demand curve,

a) only price is held constant.

b) income and price are held constant.

c) all nonprice determinants of demand are held constant.

d) all determinants of quantity demanded are held constant.

C.

Explanation:

A demand curve shows the information from the demand in the form of a graph. In the vertical axis are the prices from the market, and in the horizontal axis are the quantities the demand is willing to buy at that price.

On a linear demand curve, elastic drecreases as the price falls and the quantity demanded increases.

When reading a demand curve, assume all outside factors that no determined the price, such as income, are held constant. This is called ceteris paribus, a latin phrase that means all things held constant.

A shift of the entire curve left or right is caused by factors other than just price.

A shift in the demand curve means that at every price, consumers buy a different quantity than before.

The purpose of the ceteris paribus of all factors that no determined the price, is to concentrate in only one variable to study the case.

The correct answer is c) all nonprice determinants of demand are held constant.

Explanation:

A demand curve describes the combinations of prices and quantities demanded that can occur when all other factors that influence demand remain constant. Those other factors are the income of consumers, their expectations about the future, fashions and the prices of other related goods. The Latin expression "ceteris paribus" is used to refer to that condition that "everything else remains the same."

In these circumstances, when the only thing that modifies the demand is the price, it is when the demand curves are a useful representation and serve to analyze the effect of prices on the quantity demanded. It is said that there are "movements along the curve" instead of "movements of the curve".