a rightward shift in the demand curve for popcorn could be t

a rightward shift in the demand curve for popcorn could be the result of

(a) an increase in the price of popcorn (b) a decrease in the price of potato chips ( a substitute good) (c) an increase in the price of butter (a complementary good) (d) a decrease in the number of buyers of popcorn (e) an increase in income, if popcorn is a normal good

Solution

a rightward shift in the demand curve for popcorn is a result of increase in the demand for popcorn.

So

the correct answer will be (e) an increase in income, if popcorn is a normal good as higher demand of popcorn can be due to the increase in the income levels that is given in the option (e)

(a) is wrong because higher price will result in decrease or leftward shift.

(b) is wrong as decrease in prices of substitute good will decrease or leftward shift. demand curve for popcorn

(c) is wrong as higher price of butter will result in increase prices for popcorn which will decrease or leftward shift. demand curve for popcorn

(d) is wrong as a decrease in the number of buyers of popcorn will decrease or leftward shift. demand curve for popcorn