"The big-cap stocks are in a bull market, while the small-cap stocks appear to be in a bear market," he said.

"I've been very strongly in favor of big-cap stocks," she said.

Ford would be the choice of the big-cap stocks.

Don't they look like screaming buys compared with big-cap stocks?

If that happens, will a sharp slide in big-cap stocks bury the small caps?

Here are some theories: It was tough to be a big-cap stock in many recent years, as small-cap stocks often fared much better.

A. I think big-cap stocks will continue to dominate.

Many of those stocks were swept up in 2000, as conservative investors bought the big-cap stocks, and are still recovering from that overvaluation.

These funds, which own big-cap stocks, are also exceedingly popular among investors.

Q. Many investors worry about the lack of breadth in the market, that the gains are concentrated among a few big-cap stocks.