In the context of managing performance in not for profit organisations, which of the following definitions is incorrect?
选项：

A:Value for money means providing a service in a way which is economical, efficient and effective.;
B:Economy means doing things cheaply: not spending $2 when the same thing can be bought for $1.;
C:Efficiency means doing things quickly: minimising the amount of time that is spent on a givenactivity.;
D:Effectiveness means doing the right things: spending funds so as to achieve the organisation'sobjectives.