Car scrappage schemes a waste
If scrappage for cars is such a good idea, why not extend it to houses -- cash to demolish badly insulated houses and build new ones?
Scrapping cars is stupid when they can be repaired. Aircraft can be kept going for 40 years by re-using second-hand parts, and ships can be re-fitted. Scrappage is simply the 'car lobby' covertly manipulating governments to put public money into their coffers.
It is supposed to stimulate consumer consumption and economic growth, but nothing can grow forever; collapse eventually follows.