Why buying an inverse ETF does not give same results as shorting the ETF
Suppose that the ETF is currently at a price of $100.  Suppose that the next day it moves up 10% (to a price of $110) and the following day it moves down 5% (to a price of $104.5).  Over these two days the ETF has had a net gain of 4.5% from its original price. The inverse ETF reverses the daily gains/losses of the base ETF.  Suppose for simplicity that the inverse ETF also starts out at a price of $100.  So on the first day it goes down 10% (to $90) and on the second day it goes up 5% (to $94.5).  Thus over the two days the inverse ETF has had a net loss of 5.5%. The specific dollar amounts do not matter here.  The result is that the ETF winds up at 110%*95% = 104.5% of its original price and the inverse ETF is at 90%*105% = 94.5% of its original price.  A similar example is given here. As suggested by your quote, this is due to compounding.  A gain of X% followed by a loss of Y% (compounded on the gain) is not in general the same as a loss of X% followed by a gain of Y% (compounded on the loss).  Or, more simply put, if something loses 10% of its value and then gains 10% of its new value, it will not return to its original value, because the 10% it gained was 10% of its decreased value, so it's not enough to bring it all the way back up.  Likewise if it gains 10% and then loses 10%, it will go slightly below its original value (since it lost 10% of its newly increased value). "The most fundamental answer is that when you short a stock (or an ETF), you short a specific number of shares on a specific day, and you probably don't adjust this much as the price wobbles goes up and down. But an inverse fund is not tied to a specific start date, like your own transaction is.  It adjusts on an ongoing basis to maintain its full specified leverage at all times.  If the underlying index goes up, it has to effectively ""buy in"" because its collateral is no longer sufficient to support its open position.  On the other hand, if the underlying index goes down, that frees up collateral which is used to effectively short-sell more of the underlying.  So by design it will buy high and sell low, and so any volatility will pump money out of the fund. I say ""effectively"" because inverse funds use derivatives and contracts, rather than actually shorting the underlying security.   Which brings up the less fundamental issue.  These derivatives and contracts are relatively opaque; the counter-parties are in it for their own benefit, not yours; and the people who run the fund get their expenses regardless of how you do, and they are hard for you to monitor.  This is a hazardous combination."
"Brendan, The short answer is no, there is no need to get into any other funds. For all intents and purposes the S&P 500 is ""The Stock Market"". The news media may quote the Dow when the market reaches new highs or crashes but all of the Dow 30 stocks are included in the S&P 500.  The S&P is also marketcap weighted, which means that it owns in higher proportion the big ""Blue Chip"" stocks more than the smaller less known companies. To explain, the top 10 holdings in the S&P represent 18% of the total index, while the bottom 10 only represent 0.17% (less than 1 percent). They do have an equal weighted S&P in which all 500 companies represent only 1/500th of the index and that is technically even more diversified but in actuality it makes it more volatile because it has a higher concentration of those smaller less known companies. So it will tend to perform better during up markets and worse during down markets. As far as diversification into different asset classes or other countries, that's non-sense. The S&P 500 has companies in it that give you that exposure. For example, it includes companies that directly benefit from rising oil prices, rising gold prices, etc known as the Energy and Materials sector. It also includes companies that own malls, apartment complexes, etc. known as the Real Estate sector. And as far as other countries, most of the companies in the S&P are multi-national companies, meaning that they do business over seas in many parts of the world. Apple and FaceBook for example sell their products in many different countries. So you don't need to invest any of your money into an Emerging Market fund or an Asia Fund because most of our companies are already doing business in those parts of the world. Likewise, you don't need to specifically invest into a real estate or gold fund.  As far as bonds go, if you're in your twenties you have no need for them either. Why, because the S&P 500 also pays you dividends and these dividends grow over time. So for example, if Microsoft increases its dividend payment by 100% over a ten year period , all of the shares you buy today at a 2.5% yield will, in 10 years, have a higher 5% yield. A bond on the other hand will never increase its yield over time. If it pays out 4%, that's all it will ever pay. You want to invest because you want to grow your money and if you want to invest passively the fastest way to do that is through index ETFs like the $SPY, $IVV, and $RSP. Also look into the $XIV, it's an inverse VIX ETF, it moves 5x faster than the S&P in the same direction. If you want to actively trade your money, you can grow it even faster by getting into things like options, highly volatile penny stocks, shorting stocks, and futures. Don't get involved in FX or currency trading, unless it through futures." When you invest in an ETF or mutual fund, you're not investing in stocks or bonds. You're buying shares of a company that invests in stocks or bonds. This level of indirection is what makes it so bond funds do not 'mature.' Bonds inside of ETFs or mutual funds do have a maturity date. When they mature, the fund manager uses the principal value that is returned to purchase another bond that meets the investment objectives of the fund. So the fund never matures, since it is always investing in more bonds when the old ones mature. Unit investment trusts made of bonds do have a maturity date as well, since the portfolio does not change once the UIT is issued. As the individual bonds in the portfolio mature, the principle value is returned to investors. So the overall maturity date is effectively the maturity date of the last bond in the trust. All of the statements quoted above are accurate in explaining why there is no guarantee of a return of principle when investing in bond funds (ETF or open-ended mutual fund). The bonds they hold do mature, but are replaced within the fund as needed. The investor will never see it happen unless they watch the holdings reports filed by the funds.  The only way to have an assurance of the return of principle is to invest in individual bonds, or in unit trusts made up of bonds. A mutual fund has several classes of shares that are charged different fees. Some shares are sold through brokers and carry a sales charge (called load) that compensates the broker in lieu of a fee that the broker would charge the client for the service.  Vanguard does not have sales charge on its funds and you don't need to go through a broker to buy its shares; you can buy directly from them.  Admiral shares of Vanguard funds are charged lower annual expenses than regular shares (yes, all mutual funds charge expenses for fund adninistration that reduce the return that you get, and Vanguard has some of the lowest expense ratios) but Admiral shares are available only for large investments, typically $50K or so.  If you have invested in a Vanguard mutual fund, your shares can be set to automatically convert to Admiral shares when the investment reaches the right level. A mutual fund manager can buy and sell stocks to achieve the objectives of the fund, so what stockes you are invested in as a share holder in a mutual fund will typically be unknown to you on a day-to-day basis.  On the other hand, Exchange-traded funds (ETFs) are fixed baskets of stocks, and you can buy shares in the ETF.  These shares are bought and sold through a broker (so you pay a transaction fee each time) but expenses are lower since there is no manager to buy and sell stocks: the basket is fixed. Many ETFs follow specific market indexes (e.g. S&P 500).  Another difference between ETFs and mutual funds is that you can buy and sell ETFs at any time of the day just as if you could if you held stocks. With mutual funds, any buy and sell requests  made during the day are processed at the end of the day and the value of the shares that you buy or sell is determined by the closing price of the stocks held by the mutual fund.  With ETFs, you are getting the intra-day price at the time the buy or sell order is executed by your broker. &gt; stock funds that Rep. Paul does own are all “short,” or make bets against, U.S. stocks. **One is a “double inverse” fund**  Unless he's actually shorting a 2x bull ETF, he's losing money (regardless of how the benchmark is doing) Unless you suffer from the illusion that you can time the market, it honestly doesn't matter much; the difference is lost in the noise. That may be true even if you do suffer from that illusion.  Also, as discussed here previously, the drop in a stock's price right after the dividend has been paid just reflects the fact that you aren't about to get an immediate refund in the form of a dividend. If you look at the real cost per share, it's meaningless and can/should be ignored. Buying after the dividend is paid may save you a tiny fraction of a cent of short-term income tax, but that's meaningless in real terms. "Note that an index fund may not be able to precisely mirror the index it's tracking. If enough many people invest enough money into funds based on that index, there may not always be sufficient shares available of every stock included in the index for the fund to both accept additional investment and track the index precisely.  This is one of the places where the details of one index fund may differ from another even when they're following the same index. IDEALLY they ought to deliver the same returns, but in practical terms they're going to diverge a bit. (Personally, as long as I'm getting ""market rate of return"" or better on average across all my funds, at a risk I'm comfortable with, I honestly don't care enough to try to optimize it further. Pick a distribution based on some stochastic modelling tools, rebalance periodically to maintain that distribution, and otherwise ignore it. That's very much to the taste of someone like me who wants the savings to work for him rather than vice versa.)" How is it possible that long term treasury bonds, which the government has never defaulted on, can hold more risk as an ETF then the stock market index? The risk from long-term bonds isn't that the government defaults, but that interest rates go up before you get paid, so investors want bonds issued more recently at higher interest rates, rather than your older bonds that pay at a lower rate (so the price for your bonds goes down). This is usually caused by higher inflation rates which reduce the value of the interest that you will be paid. Do you assume more risk investing in bond ETFs than you would investing in individual bonds? If you are choosing the right ETFs, there should be a lower amount of risk because the ETFs are taking care of the difficult work of buying a variety of bonds.  Are bond ETFs an appropriate investment vehicle for risk diversification? Yes, if you are investing in bonds, exchange traded funds are an appropriate way to buy them. The markets for ETFs are usually very liquid. It's the same as with equities. If you're just buying foreign currencies to hold, you can't lose more than you invest. But if you're buying derivatives (e.g. forward contracts or spread bets), or borrowing to buy on margin, you can certainly lose more than you invest.