Answer
Increase in the price of a good is a positive incentive for suppliers. In this case, when the price of the beer is increased, the supply of pizza would tend to increase, demand would tend to decrease. As a result, the quantity supplied would increase, the quantity demanded would decrease at the same price, that is the price would remain same.
Work Step by Step
To understand it clearly, let's understand the following facts about complementary goods:
* Increase in price of a good is a positive incentive for suppliers, hence they would want to supply more quantity at the increased price. It would result in the increased supply.
* When the price of a good increase, its demand decreases. Hence the demanded quantity would decrease too.
* Price fluctuations of a good affects the demand and supply of a complementary good the same way it does to the original good. It means that the price increment of beer would affect the demand and the supply of pizza the same way as it does to beer.
