Reverse auction

A reverse auction is like a game where people bid to sell their things instead of buy. It starts with someone asking for something they want to buy, like a Lego set. Then, instead of people talking about how much they want to pay for it, they say how low they can sell it for.

So, the person who wants to buy the Lego set says, "I want to buy it for $20." Then, someone else bidding against them might say, "I can sell it to you for $18." Then another person might say, "I can sell it to you for $15."

The goal in a reverse auction is to get the lowest price you can for the thing you're buying. So, the person who wants to buy the Lego set will keep going back and forth with the sellers until they find the person who is willing to sell it for the lowest price.

And that's how a reverse auction works!