We do sort of do that, with state laws. Different states try out different laws, and copy laws from other states. Ideally a state will repeal laws that don't wo

We do sort of do that, with state laws. Different states try out different laws, and copy laws from other states. Ideally a state will repeal laws that don't work well, and copy laws from other states when they work well. In practice it's all a mess of course. California is the experimental group.