We show that the comparison of the two-part licensing mechanisms considered in the San Martin and Saracho (2015) context is exactly identical to that in Colombo and Filippini (J Econ 118:47–76, 2016) context. This means that the results obtained in Colombo and Filippini (J Econ 118:47–76, 2016) when the patentee chooses between per-unit and ad valorem royalties are incorrect. We conclude that when the convexity of the cost function is not too low, the patentee prefers to license by means of a royalty on the value of sales.

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我们表明，在 San Martin 和 Saracho (2015) 上下文中考虑的两部分许可机制的比较与在 Colombo 和 Filippini (J Econ 118:47–76, 2016) 上下文中的完全相同。这意味着当专利权人在按单位使用费和从价使用费之间进行选择时，在 Colombo 和 Filippini (J Econ 118:47–76, 2016) 中获得的结果是不正确的。我们得出的结论是，当成本函数的凸度不是太低时，专利权人更愿意通过对销售额的使用费进行许可。