You are very correct, there are some goods or commodities that we can't in a way do without them, so irrespective of the hike in price there would still be massive patronage from consumers not minding the amount it goes for.These kinds of goods are called goods of necessity. No matter what happens to the price, demand for it will not drop. The demand might even increase with a price hike. Example of these goods are foodstuff, cooking gas, transportation services etc.