Alpha—the excess return a money manager can generate, above and beyond the return due to general market effects—is an elusive beast.

It’s defined in opposition to beta, which reflects an investment’s tendency to respond to swings in the market. If your stock has a beta of 1, for example, it tends to move much as the market does. If the market rises 10 percent, and the stock goes up 10 percent (just as expected), how much credit should a manager get?

With all of the data out there—and all of the different takes on where the economy and financial markets are going—is there a warning sign that can tell us if the stock market is getting overextended?

I track several signals that are good economic indicators, but the stock market is tougher. There aren't any really good signals out there. Even the one I use most, the 200-day moving average, isn’t all that great.

One sign of a pending top, though, has become more apparent in recent weeks: investors are increasingly invoking 1999 to explain why the market is now reasonably priced.

I have mixed feelings about the Aereo decision. 

If you haven’t heard, the Supreme Court ruled this week that Aereo—a company that uses multiple small antennas to capture TV broadcasts, which it then streams to subscribers over the web—violated copyright law.

For decades now, the U.S. has essentially had to accept the oil prices set by world markets. Starting in 1973 with the OPEC-driven oil shock, the major producers have been foreign countries. If the U.S. wanted the oil, we had to pay the price.

But are things starting to change?

Also known as the “fear index,” the VIX tends to stay low when investors are feeling confident and to spike when investors get scared. Technically, it reflects the volatility of the stock market—how much things bounce around—but on a practical level, it tends to mirror recent market performance.

Yesterday, June 19, I spoke with Wall Street Journal MoneyBeat's anchor, Paul Vigna, on the keys to avoiding what is being projected as an unsettled second half of 2014 for the U.S. economy. 

I joined Maria Bartiromo on the set of Fox Business Network’s Opening Bell today, June 19, to discuss the economic impact of the crisis in Iraq.

The Federal Reserve’s announcement yesterday that it would continue its current tapering schedule—but that a rise in rates still isn’t imminent—drove markets to the 20th new high of the year.

With rising turmoil in two major oil-producing states, Iraq and Iran, the world faces an increase in oil prices—and the consequent economic damage. Fortunately, the U.S. is much better positioned to ride out the storm than it has been in the past.

Is having more information always a good thing? It’s generally hailed as such, but, depending on your perspective, the reality may be more complicated.

In the news today, there are several examples of more data leading to changes that, while painful in the short run, should yield long-term positive results.