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Prior studies have tested the long-term performance of research and development (R&D) spending, but the results are inconclusive. This study extends this line of research and explores the impact of corporate diversification on the long-term stock returns on R&D increase announcements. After controlling for the important variables in explaining the performance of R&D increases, a significantly negative association is found between the degree of corporate diversification and the long-run stock returns on R&D increase announcements. This result suggests that the costs of corporate diversification dominate the benefits regarding corporate diversification, and highlight the important effect a firm's diversification strategy has on the market valuation of R&D innovation. [ABSTRACT FROM AUTHOR]
