If the price goes up they have to pay for it. In turn they increase the price of their products and make up the difference.
We buy those products from them at a higher price.
That is how economy works.
Your name suggest that you are a Muslims. read the Hadith of the prophet about the "Hand of Allah" when people approaced to him to take action against merchants who raised their prices on goods sold at markets in Medina.
Islamic principles are dead against communist principles. Free markets and open markets are more in line with islamic principles.
problem is that none of that is discussed by our uneducated Mullahs and thats a shame.