Answer:
The Invisible hand makes sure that the prices meet the demands and nothing is crazily priced.
Step-by-step explanation:
The concept of competition is what causes this, as more producers enter a market the previous producers had to increase the quality of their products or decrease their price in order to make their goods more desirable so as someone finds a better way to produce the good at a better quality the other producers will have to make their good better as well in order to maintain their market share.