‘Scepticism about libertarian freedom’ explores libertarian freedom. Self-determination appears to take the form of freedom, but is freedom possible? Libertarianism says that when free agents determine how they react, it cannot come from prior external causes. However, many philosophers dispute the existence of libertarian freedom in principle, citing two problems. The randomness problem states that once causal determinism is banished, all that is left is uncontrollable chance. The exercise problem says that libertarian freedom can never actually be exercised, as the causal powers behind free action threaten Libertarianism. Do we abandon Libertarianism or Hobbes? The randomness and exercise problems are very different conundrums, with very different answers.