system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why was/is pizza the most popular delivery food in the west?

Is there a reason that pizza in particular became a popular delivery food as opposed to sandwiches or hamburgers?
gpt
Pretty much every ingredient in pizza is low cost and shelf stable. 

Pizza can be customized many different ways but still made quickly. 

The nature of pizza cooking is fast but holds for a significant period. 

This all makes delivery possible with low overhead and lots of options with a product that is still fresh when delivered. 

Burgers require perishables, take too long to cook and aren't peak after 10 minutes of sitting.