In the above figure, the movement from point a to point b reflects 

• a decrease in the price of pizza
• an increase in the demand for pizza
• an increase in the number of people who eat pizza
• a decrease in the number of firms producing pizza

In the above figure, the shift in the demand curve from D to D1 can be the result of

• an increase in the price of pizza
• an increase in the price of a sub sandwich, a substitute for pizza
• an increase in the price of soda, a complement to pizza
• a change in quantity demanded

In the above figure, the shift in the demand curve from D to D2 can be the result of

• an increase in income if pizza is a normal good
• an increase in the price of a sub sandwich, a substitute for pizza
• an increase in the price of soda, a complement to pizza
• a change in quantity demanded

Pizza is a normal good. In the above figure, the shift in the demand curve from D to D2 can be the result of 

• a decrease in the price of soda, a complement to pizza
• an increase in the price of hamburgers, a substitute for pizza
• a decrease in income
• a study that shows that pizza is a very healthy food

In the above figure, the shift in the demand curve from D to D1 can be the result of

• a decrease in income if pizza is a normal good
• a decrease in the price of a sub sandwich, a substitute for pizza
• an increase in the price of soda, a complement to pizza
• an increase in the number of teenagers, all of whom demand more pizza than do other age groups

In the above figure, ____ will shift in the demand curve from D to D1

• an increase in income if pizza is an inferior good
• a decrease in the price of a sub sandwich, a substitute for pizza
• buyers' expectation that pizza will be less expensive next week
• a scientific article published that demonstrates eating pizza is good for one's health

In the above figure, the movement from point a to point b reflects

• an increase in the price of pizza
• an increase in the supply of pizza
• an increase in the number of producers of pizza
• a decrease in the cost of the tomato sauce used to produce pizza

In the above figure, the shift in the supply curve from S to S1 reflects

• an increase in the quantity of pizza supplied
• a decrease in the quantity of pizza supplied
• an increase in the supply of pizza
• a decrease in the supply of pizza

In the above figure, the shift in the supply curve from S to S2 reflects

• an increase in the quantity of pizza supplied
• a decrease in the quantity of pizza supplied
• an increase in the supply of pizza
• a decrease in the supply of pizza

In the above figure, the shift in the supply curve from S to S2 might reflect 

• a decrease in the cost of the tomato sauce used to produce pizza
• a decrease in the number of pizza producers
• an increase in the price of a pizza
• an increase in income if pizza is a normal good