### Instruction: What are the main reasons for the price of a good increasing or decreasing in a capitalist society.
### Response: Prices of goods in a capitalist society are continuously set by the levels of supply and demand for goods. Reasons the price of a good may increase include the supply of the good decreasing, the demand for the good increasing, or both. Alternatively, a price of a good may decrease if the supply of the good increases or the demand for the good decreases.