How does supply and demand affect prices?

The higher the supply the lower the price will be and the higher the demand the higher the price will be. This means that they have an inverse relationship. In short, the more you need something the more you're willing to pay for it, and the less you need it the less you want to pay, and this is basically how the economy works when producing and selling.

There is an inverse relationship between the supply and prices of goods and services when demand is unchanged. If there is an increase in supply for goods and services while demand remains the same, prices tend to fall to a lower equilibrium price and a higher quantity of goods and services.