Market price is like the price tag you would see when you go shopping. It's the amount that people agree to pay for something. When you go to the store and buy an apple, the market price is how much you'll pay for it. Market prices are determined by supply and demand. If there are a lot of people who want apples, the price will go up, because there are more people willing to pay more money for them. The opposite is true if there aren't as many people who want apples - the price will go down because there aren't as many people willing to pay more money for them.