Let's look at what happened to GM when it took that $39B charge on November 7, 2007. GM's stock prices from Yahoo:
11/1 $37.25 16.66 M shares
11/2 $36.99 12.57 M shares
11/5 $36.00 15.47 M shares
11/6 $36.16 13.21 M shares
11/7 $33.95 35.12 M shares
11/8 $33.15 29.27 M shares
11/9 $31.28 21.04 M shares
11/12 $30.79 16.53 M shares
11/13 $31.62 11.98 M shares
So, the stock took a bit of a hit. I can't find the GM's market cap on 11/7/2007, but on October 30, 2006 it was about $19.19 B -
http://en.wikipedia....of_General_Motors That day the closing stock price was $34.53, so a ballpark guess is that the market cap didn't change much as of 11/7/2007.
So they took a $38B charge in the quarter when the whole company was worth about $20B, and the stock price only dropped about 7% from the previous day. Does that sound like they really lost $38B that day? Of course not. They made an accounting change.
Similarly, AT&T made an accounting change because tax law required they do so when the health care reform act was signed.
Oh, let's look at what happened to AT&T's share price since the act was signed (on Tuesday the 23th):
March 1 - $25.00
March 8 - $25.28
March 15 - $25.78
March 22 - $26.40
March 23 - $26.55
March 24 - $26.26
March 25 - $26.15
March 26 - $26.24
March 30 - $25.95
Yeah, they really lost $1B on the 23rd. Not. They took an accounting charge.
Eventually it may have a real impact on their bottom line, but so far it's just a number. The stockholders are ignoring it, just as they did in GM's case.
Q.E.D.
Cheers,
Scott.