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Human Capital Composition, R&D and the Increasing Role of Services
The authors develop a growth model with endogenous innovation and accumulation of high-tech and low-tech human capital. The models are then extended by explicitly introducing two different types of human capital and a services sector, characterized by being relatively more intensive in low-tech human capital.
Link
http://econwpa.wustl.edu:80/eps/dev/papers/0408/0408011.pdf