We turn to the Wall Street Journal for the math on what it will cost to raise taxes on corporations’ retiree prescription drug coverage. This is the provision that has caused several corporations to take markdowns recently. The bottom line: by closing this “loophole” — which was originally created to dissuade companies from dumping retirees’ prescription costs into Medicare Part D — the government could lose more than five times what it brings in. The Employee Benefit Research Institute calculates that the 28% subsidy on average will run taxpayers $665 in 2011 and that the tax dispensation is worth $233....