" Until a few years previously, the Party had still seriously been thinking of abolishing money. When the system actually worked, money was only needed as pocket money, or for the beauty parlour. But most of the time, the communist central planning system was so inefficient that it frequently broke down, rations dwindled or disappeared through theft, and people relied more and more on bribery or on unofficial markets for their essentials – for which cash, and often hard foreign currency, not the Korean won, was required. "

― Hyeonseo Lee , The Girl with Seven Names: A North Korean Defector’s Story