Suppose that each year Anna, Ben, Carol, and Dana are willing and able to buy scooters as shown in the table.

In the market for motor scooters, several events occur, one at a time.

Explain the effect of each on the quantity supplied of scooters and on the supply of scooters.

On the graphs below, illustrate the effects of each either by a movement along the supply curve or a shift in the supply curve.

Finally, explain which illustrate the law of supply.

These events are:

a. The price of a scooter rises.

b. The price of the steel used to make scooters rises.

c. The number of firms making scooters decreases.

d. Technological change increases the productivity of the factories making scooters.

Price Quantity demanded (dollars per scooter) Anna Ben Carol Dana 100 75 50 25 NN - O --0 0 N - OO