system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why don't big chains like Papa Johns, Pizza Hut, and Dominos ever sell pizza by the slice?
gpt
Selling pizza by the slice involves having multiple pizzas with different toppings ready all the time.  Which is an expense and a hassle.

If you keep the pizza fresh, then you'd end up tossing a lot of unsold product.  If you don't keep the pizza fresh, then your brand starts to suffer as customers start to judge your entire menu by bad experiences with stale singles.