This paper surveys what we know about the internationalization of business R&D spending. I examine three specific questions about the global changes in R&D activity: First, what is the evidence that R&D is becoming more internationalized (more footloose)? Second, what are the factors that...

This paper surveys what we know about the internationalization of business R&D spending. I examine three specific questions about the global changes in R&D activity: First, what is the evidence that R&D is becoming more internationalized (more footloose)? Second, what are the factors that...

We analyze the effect of patent thickets on entry into technology areas by firms in the UK. We present a model that describes incentives to enter technology areas characterized by varying technological opportunity, complexity of technology, and the potential for hold-up in patent thickets. We...