system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are places such as dentists' offices and banks only open when most of their customers are at work?
gpt
Dentists: Because they're in demand enough to make *you* come to *their* preferred hours. If the US for some reason suddenly got 100 million more dentists (that couldn't swap jobs), you can probably expect more flexible hours.

Banks: Joe Schmoe depositing and withdrawing his rent aren't how banks make money. Most of their income (from average citizens) is going to be home loans or other huge purchases with interest. They just put up with you until you decide to purchase a home, and at that point you've been with such-and-such bank for 20 years so the decision is to go with who you know. People applying for mortgages are willing to go during normal work hours.

(Their other source of income is using your money sitting around to make more money, but that's automated and doesn't need any employees at a branch.)