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- Firm growth and R&D: Evidence from the Portuguese manufacturing industryPublication . Oliveira, Blandina; Fortunato, AdelinoThis work studies the effects of R&D activities and investment, both phys ical and R&D, on the growth of firms by considering a dynamic firm growth model with serial correlation. The main hypotheses maintain that firms with a strong com mitment to R&D have a higher growth rate, and investment has a positive effect on firm growth. We investigate such relations with reference to an unbalanced panel data set of Portuguese manufacturing firms over the period of 1990 to 2001. We find that a systematic tendency for smaller firms to grow more quickly is the main reason why firm growth is not entirely stochastic.