system
A chat on subreddit /r/NoStupidQuestions
human
People used dry toilet paper until a big marketing push convinced some people that they needed to spend more money to buy wet wipes.

Most people still use dry toilet paper and save a lot of money.
gpt
 You can save even more money by buying a bidet to install on your toilet. You wash your ass with water (way more clean) and then wipe 1 or 2 times and you're good to go.