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The Dow closed above 40,000 today and investors are striking gold everywhere, but for how long?

You would think more optimism and enthusiasm is good for stocks, but often it's not.

And has the Medicare bubble burst.

Plus Microsoft makes a big bet

with plans to change how it sells call of duty.

It's Friday, May 17th. I'm Anne Marie Fertoli for the Wall Street Journal.

This is the PM edition of What's News, the top headlines and business stories that

the world today.

Medicare used to be a big moneymaker for private insurance, that is until recently. Companies like United

Health Group and Humana bet big on the government health insurance program and investors

rewarded them for it. But now the windfall is slowing down, and investors gold rush may be over.

The Baden administrations made a series of policy changes that have negatively affected

what the plans get paid.

And years of reports, lawsuits, and whistleblower accounts, accusing

big insurers of gaming the system and overcharging the government, haven't helped.

So has the Medicare bubble burst? Wall Street Journal heard on the street columnist David Wainer writes about health care,

and he joins me now with more.

...