system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can I buy something online for 99 cents and it ship from china and they make money

On ebay there are many items that the buy now price is 99 cents and they ship it from china. How can the seller possible make money on this?
gpt
The principle is called the economy of scale. They literally ship tons at a time. They might only sell orders of only a few dollars each, but use cheaper 6 week freight shipping, they can net a small profit per sale. Multiply this by a few thousand, to make shipping a container full worthwhile, and you get a tidy sum. It's not too different from how you can go to a Walmart and buy 4 tees for $5.