what causes market prices to change 
the market price of a product or service is determined by the law of supply and demand if the amount supplied is roughly the same as the amount demanded the price will stay the same when the amount supplied exceeds the amount demanded or vice versa the market price will decline or increase the bottom linemarket price is the current cost of any product or service and it is by definition a moving target in any free market economy market price is determined by supply and demand changes in either of those factors will cause market price to increase or decrease 