The prices of the items you buy are not based on how much they cost to produce. The price is based on what people are willing to pay. And the corporations know that most people aren’t paying that much attention.
If you put things into your grocery cart without considering what the price was two weeks ago or two months ago, they’ll just keep jacking up the price.
Have you noticed that the price of coca-cola has doubled in the past 5 years? Do you look for alternatives, or do you just keep putting it in your cart? Is there a point at which you’ll stop buying a particular thing, or does it have to be truly egregious?
Be aware that many businesses drive down cost through labour exploitation, using cheap unecological materials etc. Consumers should also take into account how businesses are taking their social/environmental responsibilities.