I thank a reader for pointing out an interesting article in the Korean Political Science Association Journal which contains a plethora of qualitative data on the North Korean labor Market–survey data from a cross section of defectors.
Here is the citation:
Park, Young-ja, “‘Marginal Work’ and ‘Labor Market’ in North Korea after the 2003 General Market System”, Korean Political Science Association Journal Vol. 43, No. 3, September 2009