Assume that microbrewery beer is a normal good. Prices of microbrewery beer have risen steadily in recent years. Over this same period, prices for fermenting vats used in beer making have also risen and consumer incomes have fallen. Which of the following best explains the rising prices of microbrewery beer?
A) The supply curve for microbrewery beer has shifted to the left while the demand curve for microbrewery beer has shifted to the right.
B) The demand curve for microbrewery beer has shifted to the left more than the supply curve has shifted to the left.
C) The demand curve and the supply curve for microbrewery beer have both shifted to the right.
D) The supply curve for microbrewery beer has shifted to the left more than the demand curve has shifted to the left.

Microbrewery beer is a normal good. Its prices have increased recently in recent years. The prices for fermenting vats used in beer have also risen and the consumer income has fallen.

Since beer is a normal good an increase in its price and decrease in the consumer income will decrease its demand. As a result, the demand curve will move to the left, decreasing the price of the product.

At the same time, the increase in the price of fermenting vats will increase the cost of producing beer. This will cause the supply of beer to decrease.

This will cause the supply curve to shift to the left. If the leftward shift in the supply curve is more than the leftward shift in demand, the price of beer will increase.