So we have supply, which is how much of something you have, and demand, which is how much of something people want. Put the two together, and you have supply and demand.
Now, how do you show the relationship between the two? One way is to use the price of something. Generally speaking, the price of something will go up if the demand goes up. Why? Because the seller thinks he or she can get more money for whatever he or she is selling….
