Suppose there is no imitation, license contract with two-part tariff or pure royalty per unit may be the optimal licensing strategy in product-differentiated Cournot Duopoly.

假设不存在模仿的可能性，发现在古诺异质产品市场中，两部制许可方式和单一的提成许可方式都有可能成为最优的许可权策略。

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But the recommendation was overruled by two more senior members of the Firearms Licensing Unit, who, the report said, feared the force would lose any subsequent appeal by Atherton as he had never been convicted of an offence.

BBC: Horden shootings: IPCC highlights Durham Police failings

The examination into the way the firearms licensing unit was run is damning.

BBC: Murdered family's relatives say gun laws must change

Retired Ch Supt Carole Thompson-Young, whose role included heading the force's firearms licensing unit, said he was known to have a history of violence towards Mrs McGoldrick.

BBC: Horden shootings: Police could have revoked gun licence