Exchange Traded Funds (ETF) are the largest growing sector of the investment market, with at least $1,000 billion invested in them. Look no further than the natural gas market, where Bloomberg reported that the equivalent to 86% of all natural gas contracts, on a given day, were held by the United States Natural Gas Fund (NYSE:UNG).

TUTORIAL: Exchange-Traded Funds

For the retail investor, an ETF like the SPDR S&P 500 ETF (NYSE:SPY) is a good choice to gain exposure to an index fund, but there's another class of ETFs that's best left to the professional traders. Leveraged ETFs make $1 of buying power into $2 or more. The ProShares Ultra S&P 500 (NYSE:SSO) is a leveraged ETF that moves at twice the rate of the Standard & Poor's 500 Index (S&P 500). If the index moves five points, the SSO moves as if the S&P moved 10 points (minus fees built in to the fund). Other leveraged ETFs may react as if the S&P moved 15 points. (For more, check out Leveraged ETFs: Are They Right For You?)

These ETFs can be a source of great gains, but can also be a source of great loss. Doug Kass, a professional trader for more than 20 years, calls these funds, "the new weapons of mass destruction." Here's why:

High Volatility
According to Bespoke Investment Group, in one 30-day period, the rate of volatility in the S&P 500 was, "up 8.31%, down 7.34%, up 5.34%, down 5.68%, up 7.38%, down 8.70%, up 7.34%, down 10.14% and up 6.65%." If there was somebody who could time these changes perfectly, it would have resulted in a 91% gain in their portfolio, but this rate of change is too large for most retail traders to handle. If an investor held leveraged ETFs during this time, and wasn't in a position to watch them throughout the day, the losses could have been substantial if they were sold too early or late.

High Amounts of Management
Professional traders, who track the market all day, are in a better position to manage these leveraged ETFs than a retail investor, who may not have access to their portfolio during the work day. These types of trades require constant management, which makes them inappropriate choices for most retail investors.

Hard to Understand
What's the difference between an ETF and an exchange traded note (ETN)? What's the VelocityShares Daily 2x VIX Short-Term ETN (NYSE:TVIX), and how exactly does it track the performance of the Chicago Board Options Exchange Market Volatility Index? For the easier to understand ProShares Ultra S&P 500, what should you know about rebalancing a fund and how does that affect the price from day to day? Some investors make the mistake of investing in a product they don't understand, and that can lead to unexpected results. (To learn more about ETFs, read An Inside Look At ETF Construction.)

ETFs may be exploding in size, but that doesn't mean that all of them are catching on. Take the iShares S&P Target Date 2050 (NYSE:TZY), for instance, which aims to construct the perfect retirement portfolio for those with a target retirement date of 2050. Although it may sound like a good idea, the average daily trading volume is only 89 shares. For those who purchase an ETF, like this or other low volume name, selling these shares at a fair value may be difficult.

Day Trading
Leveraged ETFs may look attractive as ways to make more money with less of an investment, but their use isn't what some investors think. Professionals and day traders often use these funds for very short-term trades, often not more than day trades to make bets on the movement of certain types of investments. They may also be used to hedge or protect a portfolio without committing large amounts of capital to it.

The Bottom Line
Although these leveraged ETFs are commonly used by professional traders, retail investors are best served by staying with non-leveraged ETFs, or at least making them a small fraction of their portfolio. Levered ETFs are easily spotted by looking for a "2X," "3X" or "ultra" in the fund name. Make sure to read the description of the fund before investing. (To improve your knowledge with ETFs, see Dissecting Leveraged ETF Returns.)

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