Without a doubt, there is a grand experiment in economic policy taking shape across the country that could lead to a significant increase in the number of low to no-income tax states.

FORBES: States Push Back Against Obama's Knee Jerk Tax-Increase Addiction

His economics GCSE class is an experiment, part of a policy of promoting more academic subjects.

ECONOMIST: Bagehot: Lessons from a great school | The

But if history is any guide, foreign policy as a political-science field experiment or what-me-worryism will yield some ugly results.

WSJ: Eliot Cohen: American Withdrawal and World Disorder

But he does seem a little more willing to experiment, before concluding that monetary policy in general has been "maxed out".

BBC: Mervyn King still ne regrette rien

The higher minimum wage can be set to sunset in 8 years conditional on what the experiment has shown about the impact of the policy.

FORBES: What We Need Is A Randomized Minimum Wage

The law will experiment with cost controls that economists and health policy experts think could curb spending, but there's little certainty and a lot of politics likely to interfere while reform is being implemented and tweaked.

WHITEHOUSE: Health Care Blog | The White House

First, Germany provides a natural experiment of Keynesian versus Non-Keynesian labor market policy.

FORBES: Why Obama Cannot Match Germany's Jobs Miracle

It reflected not just a distorted picture of a critical episode in American foreign policy but a seeming ignorance of the important lessons that Americans drew from this brief and unhappy experiment in creating an overseas empire.

NPR: 'Folly of Empire' Offers Critique of U.S. Imperialism