If you need proof that the economy is looking up, you need only look as far as your neighborhood car lot, or maybe even your own driveway. This week it was announced that there was a major bump in March auto sales. How major? Chrysler alone experienced a 34% increase in sales over the course of the month. Paul Eisenstein is the publisher of TheDetroitBureau.com. He explains what to make of these auto numbers, and whether they’re sustainable.