There is a same product and a substitute, the closure of other pizza shop is the same product and the hamburgers are substitute to pizza.
Substitute is the similar nature of product, it is not the same product as the original product but the nature of satisfaction the product provides is the same and the product can be used as a substitute.
The increase in the prices of pizza in a college can be due to both the effects as both the products are same and substitute to the product. The closure of the pizza parlors provide the opportunity to the remaining pizza sellers as the only available option and being a monopolist in the area for pizzas.
Increase in the price of hamburgers at local shop is also a factor due to which the prices are increased because the substitute is also expensive so the consumer would pay more for the pizza as well if paying more for hamburger.
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