The staples do much better, even some of the financials the last part of the year, come into favor.

FORBES: 4 Stocks with Potential for the New Year

The key is to always buy into a sector that is about to come into favor while selling the sector that has reached its peak.

FORBES: How To Use ETFs For Sector Rotation Strategies

The weaker dollar-stronger gold correlation has come back into favor for whatever reason now.

FORBES: Softer Dollar, 'Trend Reassertion,' Asian Demand Send Gold Higher

When currency markets become over-inflated, hard assets like commodities come into more favor with investors.

FORBES: Comex Gold Firmer On Follow-Through Strength From Tuesday's Big Surge

If Italian stocks come back into favor, Eni investors could get an uplift.

WSJ: Why Italy Looks Cheap

In our Off the Charts newsletter, we have highlighted a few cloud computing stocks that have come back into favor.

FORBES: Stick With Apple And Its Three Amigos

There is good chance that growth industries will come back into favor this decade given the slow growing global economy and less opportunities for cyclical industries.

FORBES: U.S. is Where the Growth Is

Different strategies or styles may go out of favor and then come back and you can run into trouble.

WSJ: How Are Mutual Funds and ETFs Rated?