This is just false. The OP had the correct idea, demand for essential goods is inelastic. This doesn’t go away if you “get rid of capitalism”. All economies have price increases. If you ban them, you just get shortages and things get sold on the black market (as was the case in the Soviet Union).
The real issue is: what is “essential”? The items we think of as essential are mostly conveniences. Disposable diapers are not essential. Washable diapers existed for thousands of years, and they are way better for the environment. Your kids don’t have disposable clothes. You just wash them when they are covered in vomit or feces. So why not diapers?
Maybe we should consider alternatives to “essential” items. Toilet paper is expensive? Get a bidet. Baked goods are expensive? Get some butter and flour. Beer is expensive? Good news: alcohol just appears for free when you give yeast food! Your home repairs are expensive? Literally watch a YouTube video.
It’s easier than ever to do things on your own. Don’t hand out money unless you want to. And realize the choice you are making.