本文討論在生產成本不對稱的寡佔市場下，考慮專利授權對廠商研發活動可能產生的影響。我們發現：當研發相形困難時，相對於未授權之情況，低成本廠商之研發動機將越高，而高成本廠商的研發動機將越低，所以專利授權將更形惡化廠商之間的成本差距。另外，在考量專利授權的情況下，當生產成本差距擴大，不論成本高低，廠商之研發動機皆會降低。而若比較專利授權與研發合作對廠商研發動機的影響，當成本差距較小時，專利授權則將相對帶來更多的研發動能。

We discuss how the patent licensing may impact the R&D activities of duopoly firms with different production costs. We found that: with the possibility of patent licensing, the more efficient firms will spend more in R&D, and the less efficient one will spend less, when it is more difficult to innovate. As a result, the patent licensing widens the difference in firms’ production costs. Besides, the incentive to innovate for either firm decreases under patent licensing as the original gap between costs increases. Moreover, when comparing to the R&D cooperation, both firms will be engaged in more R&D activities under patent licensing, when the difference between costs is relative small.

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