Remember "TARP," "Too Big to Fail," "Government Motors," "pay czar," the buzzwords of the Bush-Obama era? They reflected a disturbing trend toward presidential interference in economic life. Forty years ago this week, President Richard Nixon showed us just how dangerous unchecked executive power can be to the free-enterprise system. On Aug. 15, 1971, in a nationally televised address, Nixon announced, "I am today ordering a freeze on all prices and wages throughout the United States." After a 90-day freeze, increases would have to be approved by a "Pay Board" and a "Price Commission," with an eye toward eventually lifting controls...