Cash for clunkers was a shining example of the government's complete incompetence in business matters (if nothing else).
They really thought that it was a good idea to not only destroy millions of perfectly good vehicles when it was clear that there was a recession on the horizon (obligating the people to new, expensive car payments). On top of that, they caused a temporary demand spike which was promptly followed by a demand dip for months afterward... right when the auto companies were struggling to re-tool their production lines and scale thier operations to fit the changing market. At the time, it was probably the worst thing that could have happened, as they were forced to hire temporary workers and pay huge overtime expenses throughout their supply chain, then promptly fire their workers and suppliers a month later.
Nobody won in cash for clunkers except the politicians. Obviously there was not a single person working on that program who has ACTUALLY worked outside the public sector. Cash for clunkers was one of the most bone headed moves our government has made in recent history.