Very little, which is why supermarket owners make everything they can to make sure they - and not their workers - get most of it. You still can't understand that the least lucrative industries are the ones where the owners and managers are the most cruel against the workers?

So if the profit margin is low, capitalism is bad cuz the workers are exploited.. ... and if the profit margin is high, capitalism is bad cuz the workers are exploited?

got it!

Meanwhile under communism.. the workers are exploited everywhere and the profit margin is 0 everywhere, except the black market, and the black market is the only place you can find anything.

Meanwhile under socialism, in all Nordic countries, the profit is shared more evenly and you get perks such as cheap universal medical care.

The USSR fell more than 30 years ago. Trump is very very chummy with Xi and Kim. Find yourself another scare.