convince store

Why are Convince stores allowed to raise the price of products double sometimes triple the original price or the cost to make it? An example would be the bags of chips that use to sell for 25 cent that now sell for 65 cent. Why is that and is there any law to help protect the people of the United States from price gauging. Why are stores being allowed to steal from the American people? Not only does it hurt the people but the economy. Prices continue to soar while the price of minimum wage stays the same. This keeps the middle and lower classed stressed and working harder to afford what the convince stores have set a price to fatten their pockets.