Should there be markets in everything? In the aftermath of the Supreme Court’s ruling on Obamacare, the sharpest analysts pointed out that Chief Justice John Roberts’ interpretation of the individual mandate as a tax (rather than a fine or penalty) undercut the fiscal logic of this approach to healthcare reform. Defenders of Obamacare had been appealing to “behavioral economics,” arguing that because Americans are a law-abiding people, we would comply with the individual mandate not because the penalty was so high that it made economic sense to purchase a plan, but because our sense of citizenship makes us averse to violating…