This study investigates the role of international spillovers in generating productivity gains for a panel of 24 OECD countries during the period between 1971-2004. We use recent techniques developed in a common factor framework to characterize the global interdependence implied by international spillovers and the diusion mechanisms involved. Consistent with some recent studies in this eld, the evidence suggests that there are substantial crosscountry spillovers mainly related to R&D and human capital variables, which contribute signicantly to productivity.

Donors who test repeat-reactive on initial screening but negative/indeterminate on confirmatory testing for HBsAg, anti-HCV, anti-HIV are eligible for re-entry after a 6 month deferral period. If the donor again tests repeat reactive for the same or a different marker, he/she is then permanently deferred, even if the final interpretation is not 'confirmed positive'. The current donor re-entry program does not include repeat-reactive, confirmatory-negative HTLV. Donors who test repeat-reactive on initial screening but negative/indeterminate on confirmatory testing for any marker are acceptable for autologous donation.

In this paper, we analyze the long-term impact of an environmental policy on economic growth, pollution and welfare. A standard growth model with horizontal innovation is modified by including pollution which comes from the use of intermediate goods production. Taxation on pollution reduces profits of final good producer as well as intermediate good producers. In this setting, profit gains is explained by a realloaction of labor from intermediate goods sector to R&D sector which enhances innovation, growth and welfare while it reduces pollution.

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