system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How have most restaurants maintained high drink prices when McDonalds sells any size of drink for $1?

I feel like other companies would need to follow suit to keep up with the competition, yet this hasn’t really happened.
gpt
You are having a date at a restaurant. You want a soda while you are in the middle of a meal. Will you get up and walk to the McDonalds a block away to buy a large soda?

Competition is a thing but it isn’t just competition for a product, it also involves convenience.