This paper considers the problem of pricing American options when the dynamics of the underlying are driven both by stochastic volatility following a square root process as used by Heston (1993) and by a Poisson jump process as introduced by Merton (1976). The two-factor homogeneous...

I present evidence to suggest that an important share of the apparent geographic localization of spillovers from industrial R&D may be an artifact of other agglomerative forces. A production-function framework is used to examine the role of geographic and technological proximity for interfirm...