Most of the myths regarding market moves are not worth the paper they're printed on. That said, one old wives' tale worth noting, and even following, is the January effect.
For whatever reason, small-cap stocks do indeed outperform their larger brethren during the month of January.
I recently provided a list of 5 Stocks for the January Effect. On the list was a former high-flyer that lost enough market value to now qualify as a small-cap stock -- NutriSystem (NASDAQ: NTRI).
NutriSystem captured the investor imagination with its unique solution to weight loss and weight management. The company's home delivery of prepackaged meals promised ease of use with results.
Given the huge audience for such a solution, NTRI presented investors with a great growth opportunity. Even though it took a few years to catch on, investors eventually got the idea.
NutriSystem became a darling of the momentum crowd in 2005. In the span of a year and a half, the stock moved from the single digits to above $80 per share. Coinciding with a big marketing program, revenue and investors seemed to grow in tandem.
That's all well and good, but at some point valuation does matter. That time usually comes when growth or results fail to meet elevated expectations. For NTRI, that started to happen in mid-2007.
In no time flat the stock lost more than half its value as the momentum crowd fled. The stock has been trading on a flat line around $15 per share for most of 2008.

This week, I've been working on a
Update: See the latest posts about 
One asset class that has outperformed the broad market for nearly a decade is small cap. Since the low in April 1999, the
Sunday's New York Times had a column by Paul J. Lim about the performance of large caps vs. small caps in 2006. Small cap stocks beat the big caps this year, but only because of a huge January, where small caps soared over 7%. The piece addresses the difficulty of handicapping which group will outperform. Financial planner James A. Shambo said that "the market has a tendency to do what most of us think it won't do. It loves to humiliate us."

