It's sponsored by the Libertarian Alliance of the UK, in honor of the late Chris Tame, and Sean Gabb choses the subject. This year, it is: "Can the Libertarian Society Be Described as 'Tesco Minus the State'?" The prize is 1,000 British pounds. Here are the details.

Not that I would want to skew anyone's entry, but to defend limited liability is simply to defend the right of contract.