What are some factors that effect price changes

Some things that effect prices of products you buy is wage for labor, so it might get harder to supply it. The demand of that product could go up or down so that will change the price. Peoples income also chages the prices of products.

How recent changes in supply have affected product that you regularly purchase

An older change in supply was when they stopped selling sour twizzlers. They stopped selling it because people were buying more sweet twizzlers and other sour candy that was coming out. They now haven't sold those for five years.

how much do you benefit from a market economy/what problems might you encounter

you benefit a lot from a market economy because you get to choose what you want to buy. there are also many choices of things to buy in a markt economy and the seller choose the price. some problems are a gap between rich and poor. homelesness is a problem and not evryones needs are met.