Demand Curves: slope downward from left to right . Which of the following could increase demand for a good: all of the above. A shift of the demand curve represents: a change in demand. In economics, demand means: willingness and ability to buy a good. If the number of buyers in the market increases, which of the following will happen: The demand in the market will increase. What will happen in the car market if consumers expect higher prices in the near future: The demand for cars will increase. When goods are substitutes, which of the following occurs: The demand for one good moves in the same direction as the price of the other good. With complementary goods, which of the following occurs: The demand for one good moves in the opposite direction as the price of the other good. A normal good: will be in higher demand if a person's income increases. A change in quantity demanded can be caused by: price. If a decrease in income increases the demand for a good, the good is: inferior