In the U.S. many people do not choose their food wisely because it is cheaper, and that ends up with them being fat, and who they are buying from rich.
These people live in huts carved out of trees. They live off the land, gathering food, resources, and water from their surroundings. The jobs the people have are based on what they are good at in their family.
Communism lets the government choose everything for its citizens, and they also own everything. In this scene the man is not allowing her to have a job because Kim Jong-Un does not want her to.
(Lets just say all that food is not actually all burgers) People can also make good choices for what they think is good for them as people, which is a benefit of being in a market economy.
These people have their own culture, they trade with other families in the region by trading, and they are not bound by any government.
In this example of socialism, the woman is allowing the two boys to work at her restaurant because the boys and her can choose their own jobs.