I'm wondering if part of our issue with crazy inflated prices despite low margin for industry and manufacturing actors is not because of this abused margin for retailers. That have also a huge power as it is difficult to negotiate when you depend on your product to be buyable in the market.
To me, that explain a big difference with asian world, where you notice, even for asian shops in western countries that prices are still quite cheap.
Something parallel to that that I have noticed is that decades ago we were used to buy from small individual shops, but now a few retailers and chains have almost a monopoly on the market.
I see the same pattern for movie theaters. They used to be independent mostly with affordable prices. Now 2 or 3 big chains bought them all, and it is very rare to still encounter independent movie theater. And once they got a good monopoly, ticket prices skyrocketed to insane levels.