1. The market for ‘lemons’: quality uncertainty and the market mechanism;Akerl;Q. J. Econ.,1970
2. Competitiveness of regions from an evolutionary perspective;Boschma;Reg. Stud.,2004
3. Modern Industrial Organization;Carlton,2005
4. Why do national labor market practices continue to diverge in a global economy;Christopherson;Econ. Geogr.,2002
5. The employment relation and the spatial division of employment;Clark;Ann. Assoc. Am. Geogr.,1981