Alright kiddo, imagine you and your friends are having a lemonade stand. You all have the same recipe, cups, and lemons. Each of you wants to sell as much lemonade as possible, but you also want to make a profit.
In a perfect market, everyone who wants to buy lemonade has all the information they need to make a good decision. They know how much it costs, what ingredients are used, and they can easily compare prices between different lemonade stands.
This means that all of you have to compete with each other to make the best tasting lemonade and sell it at a fair price. If one of your friends tries to charge too much for their lemonade, people will just go to a different stand where the prices are lower.
In a perfect market, nobody has any power over the prices or the quality of the lemonade. Everyone has to work hard to make a good product and sell it at a fair price. This way, the lemonade market can be strong and healthy, and everyone can enjoy a refreshing drink on a hot day.