system
Given the following post, respond as if you're commenting on Reddit:
human
Why does the economy NEED to grow constantly?
gpt
Population growth. 

We've gained 100MM people in the last 30 years. In the next 30 we will probably add 200MM. Those people will need houses in which to live, jobs at which to work, food to eat, cars and roads to drive them on, etc. If they don't get those things, they will either go somewhere else for them or take them off of people by force. Then things start getting... messy.