A central and controversial component of the Affordable Care Act is the individual mandate, which requires individuals to purchase health care insurance or face a penalty. What is the individual mandate and why is it an important component of the Affordable Care Act, given its goal of ensuring that all Americans have health insurance? Why might someone think that the government has a duty of justice to ensure that all Americans have decent health insurance? Why might libertarians such as Robert Nozick claim that the mandate is an unjust policy? Are they right to think this? Why or why not? If they are right, is there an alternative just way to realize the goal of universal health insurance? For example, is it permissible for the government to use tax revenue to fund a single-payer system similar to Medicare?