Before 2005,peer-to-peer networks and illegal music download sites operated with impunity - even charging for their services, in some cases.

VOA: standard.2009.04.23

If Firm II is charging C, Then a best response for Firm 1 is to set price equal to marginal costs, and if Firm 1 is pricing at marginal cost, then conversely a best response for Firm 2 is to price at marginal cost.

如果公司2选择了C,公司1的最佳对策是,定价在边际成本,如果公司1定价在边际成本,同样的,公司2的最佳对策,也是定价在边际成本

耶鲁公开课 - 博弈论课程节选

He warns that even though Google may start out by not charging for access to what it digitizes, it may eventually impose big fees to use its online library.

VOA: standard.2009.12.31

Assured Labor is not charging anyone right now, but the plan is to have employers pay for the service.

VOA: special.2009.02.02

Republican leader Charles Evans Hughes and other leading Americans called for the Justice Department to obey the law in arresting and charging people.

VOA: special.2010.12.09

But industry experts say card providers might now start charging new fees for all cardholders.

VOA: special.2009.05.22

The roads would even have power stations for charging electric cars.

VOA: special.2009.06.19

The Obama administration has made no move to prosecute former high ranking Bush administration officials for torture, but has left open the possibility of charging anyone who exceeded Bush-era guidelines on the treatment of terror suspects.

VOA: standard.2009.08.24