system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why Walmart is bad.
gpt
Like You're Five:  Let's say that you live in a neighborhood with a lot of big lawns that need mowing.  Most people will pay a neighborhood kid to mow their lawn, say $10.  A new family moves in, and they have a couple of kids.  The new family's older brother goes around and promises to mow lawns for $5, and everybody signs up.  Instead of mowing the lawn himself, he makes his little brother do it for $3.  The little brother doesn't do a very good job, but enough people like the savings that they keep using them.  Eventually, the older brother hires more kids at $3 an hour to keep up with demand.

So, what happens?  Most of the kids who were doing a good job for $10 are out of business. The little kids are hardly making any money, so they doesn't get as many comics, snacks or toys as the other kids, even though the same amount of work is getting done.  The neighborhood looks kind of shabby, because everyone is going with the cheap service instead of the nice one.

Is this a problem?  Well, it kind of depends on who you are:  Are you one of the people who own a house and want the cheaper, "good enough" lawn mow?  Are you one of the kids who thought they were worth $10 and now have to find a new job?  Are you one of the kids who are mowing lawns for $3?  Everybody has a different perspective.