This one came up over drinks last night: If you could institute one law (presumably in an attempt to fix the shortcomings of the current system), what would that one law be?
Hayek was asked this question late in his life, and responded with something to the effect of "The law should apply to everyone equally." I think that's a little broad; we thought his intention for that was something like "no subsidies because they don't go to everyone," but you could argue that everyone could get a subsidy if they did the subsidized activity. We also didn't have the exact words-- perhaps it was framed better than that. (Anyone?)
The challenge here isn't just the intention-- I think most people have the right idea-- but structuring it, like every good law, so as not to be manipulated or worked around.
My answer's in the comments...