TIM CAVANAUGH: Artificial Housing Respiration: Government-sponsored housing inflation is locking the next generation out of homeownership. “It’s easy to see why interested parties such as the National Association of Realtors would support interventions such as those above and the $8,000 Home Buyer Tax Credit. . . . Imagine a yard sale outside the biggest, fanciest house in town. You get there early, eager to buy cool stuff cheap. But every time you see something you like, a police officer comes along with a Sharpie, crosses out the price, and writes in another number that’s two or three times higher. Scale that up a bit, and you have the Obama housing plan.”