After the famine in 90s both the party and the people realized that the state can't really guarantee any food security so it's mostly taken care of by free mark

After the famine in 90s both the party and the people realized that the state can't really guarantee any food security so it's mostly taken care of by free market as anywhere else in the world now. Trading goods may not be entirely legal, but is widely accepted. Check "North Korea Confidential" by Daniel Tudor and James Pearson from 2015.