Gu, Wulong; Tang, Jianmin - In: Economics of Innovation and New Technology 13 (2004) 7, pp. 671-686
Empirical studies commonly use research and development (R&D) to measure innovation and often find, especially in Canada, no strong link between productivity and innovation. In this article, we model innovation as an unobservable latent variable that underlies four indicators: R&D, patents,...