Ace of Spades has a great post on this.
And Volokh highlights a piece of a WSJ column:
I see that David Yermack said it better.
In 1993, the legendary economist Michael Jensen gave his presidential address to the American Finance Association. Mr. Jensen's presentation included a ranking of which U.S. companies had made the most money-losing investments during the decade of the 1980s. The top two companies on his list were General Motors and Ford, which between them had destroyed $110 billion in capital between 1980 and 1990, according to Mr. Jensen's calculations.
I was a student in Mr. Jensen's business-school class around that time, and one day he put those rankings on the board and shouted "J'accuse!" He wanted his students to understand that when a company makes money-losing investments, the cost falls upon all of society. Investment capital represents our limited stock of national savings, and when companies spend it badly, our future well-being is compromised. Mr. Jensen made his presentation more than 15 years ago, and even then it seemed obvious that the right strategy for GM would be to exit the car business, because many other companies made better vehicles at lower cost. . . .
Over the past decade, the capital destruction by GM has been breathtaking, on a greater scale than documented by Mr. Jensen for the 1980s. GM has invested $310 billion in its business between 1998 and 2007. The total depreciation of GM's physical plant during this period was $128 billion, meaning that a net $182 billion of society's capital has been pumped into GM over the past decade -- a waste of about $1.5 billion per month of national savings. The story at Ford has not been as adverse but is still disheartening, as Ford has invested $155 billion and consumed $8 billion net of depreciation since 1998.
As a society, we have very little to show for this $465 billion. . . . Yet one can only imagine how the $465 billion could have been used better -- for instance, GM and Ford could have closed their own facilities and acquired all of the shares of Honda, Toyota, Nissan and Volkswagen.
The implications of this story for Washington policy makers are obvious. Investing in the major auto companies today would be throwing good money after bad. Many are suggesting that $25 billion of public money be immediately injected into the auto business in order to buy time for an even larger bailout to be organized. We would do better to set this money on fire rather than using it to keep these dying firms on life support, setting them up for even more money-losing investments in the future.