One of the thicker files here at the office is a well-used folder labeled simply "Happiness."
There's nothing in it from the likes of popular spiritualist and writer Deepak Chopra. Instead it's filled with the work of financial writers, psychologists and economists, all on the topic of money and happiness.
It's a great economic topic. What could be more fundamental than whether more money — getting it, having it, spending it — makes people happier?
The answer, of course, is that more money usually doesn't. It can even make a person feel worse.
"It's only money. Really," begins one article, a 2006 personal finance column by Jonathan Clements of the Wall Street Journal. Another of his ran in 2005 under the headline "Rich, Successful — and Miserable."
Then there's the New York Times article entitled "The Joy of Delusion," a review of the 2006 bestselling book "Stumbling on Happiness." It seems we humans are lousy at predicting what will make us happy. It's one reason why we pursue money or a bigger house. We are somehow completely unaware they won't make us happier.
The last article dropped into the file was published just this month, an essay by the writer Michael Lewis. It was easily the most depressing.
Lewis wasn't sure he bought the argument of a book he was reviewing, on the political influence of billionaires. But he has become convinced that wealth changes a person — and not for the better.