Update: Many readers and other people who have seen this quote making the rounds on Wall Street believe it is a hoax.

Hedge fund manager Whitney Tilson sends out wonderful e-mails about every day. I just got a new one today, and he included this incredible quote from Karl Marx:

"Owners of capital will stimulate the working class to buy more and more of expensive goods, houses and technology, pushing them to take more and more expensive credits, until their debt becomes unbearable. The unpaid debt will lead to bankruptcy of banks, which will have to be nationalised, and the State will have to take the road which will eventually lead to communism. (Das Kapital, 1867)

What does it all mean? I'm not really sure. But Karl Marx's theory that capitalism would inevitably lead to communism has mostly been dismissed -- proven wrong by the survival of capitalism and the fall of communism.

And while it is true that there was a fat lady singing at Obama's inauguration (she was great by the way -- just sayin'), Karl Marx may still have the last word yet.

Of course some Republicans will point to Obama as a step toward socialism. So does that mean Marx was right?

These days, investors have to search far and wide to find positive data points, let alone a positive outlook, for the U.S. and global economies.

And, without question, the financial crisis and slowing global growth, combined with previously weak economic fundamentals in the U.S., are indeed formidable obstacles to any investor's hope for optimism.

Still, perhaps the real the danger lies in not where we are but in denying where we can be, and that's where John Maynard Keynes comes in.

For those unfamiliar, Keynes, along with Milton Friedman and Karl Marx, are the three major philosophers of modern economics.

In the United States, policy markers since 1981 have favored market absolutism, Friedman's view, peppered by government intervention, Keynes' view, when needed.

More recently, during the current decade, market absolutists appeared to have had free rein. Some of these market absolutists are now arguing that 'the market should run its course' and 'recessions, even deep recessions, are an essential part of the business cycle,' etc. Don't believe any of it for a moment, Keynes would say.

Expansion is the normal condition

It was part of the genius of Keynes that he revealed to us that the natural state of the economy is expansion and that a downturn is "extraordinary imbecility." Further, Keynes also reminds us that recessions, or economic downturns, are not necessarily self-correcting.

Keynes also believed that the market economy, in the form of mixed capitalism, could survive only if it earned the support of the public by raising living standards.