Abstract
Because an agent's constitutive luck may seem to preclude free will, it may seem to preclude moral responsibility. An agent is basically morally responsible for performing action A at time t only if there is another possible world with the same past up to t and the same laws of nature in which the agent does not perform A at t. A compatibilist can solve the constitutive luck problem for moral responsibility without worrying about basic moral responsibility. According to compatibilism, if determinism is true, then agents can be morally responsible for performing actions without being basically morally responsible for performing them. But a libertarian who thinks agents can be basically morally responsible for what they do must explain how basic moral responsibility is possible. ACT-endorsing libertarianism can both solve the constitutive luck problem for moral responsibility and explain how agents can be basically morally responsible for what they do.