The agency argument is the claim that agents (individuals acting on behalf of others) are morally responsible for their actions. This argument has been made by many philosophers, including Immanuel Kant and John Stuart Mill. The basic idea is that agents are responsible for the consequences of their actions, even if they did not intend for those consequences to occur. This is because agents are assumed to have a certain degree of control over their actions and the ability to foresee the potential consequences of those actions.