Is there a widely recognized bond index?
Multiple overlapping indices exist covering various investment universes.  Almost all of the widely followed indices were originally created by Lehman Brothers and are now maintained by Barclays.  The broadest U.S. dollar based bond index is known as the Universal.  The Aggregate (often abbreviated Agg), which is historically the most popular index, more or less includes all bonds in the Universal rated investment grade.  The direct analog to the S&P 500 would be the U.S. Corporate Investment Grade index, which is tracked by the ETF LQD, and contains exactly what it sounds like. Citigroup (formerly Salomon Brothers) also has a competitor index to the Aggregate known as Broad Investment Grade (BIG), and Merrill Lynch (now Bank of America) has the Domestic Master. Multiple other indices also exist covering other bond markets, such as international (non-USD) bonds, tax-exempts (municipal bonds), securitized products, floating rate, etc. "The iShares Barclays Aggregate Bond - ticker AGG, is a ETF that may fit the bill for you. It's an intermediate term fund with annual expenses of .20%. It ""seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the Barclays Capital U.S. Aggregate Bond Index""" Keep in mind that the bond market is dominated by US Treasury securities... if there were an S&P 500 for bonds, the US would take positions 1-400. Be careful that you understand what's in your bond funds -- you may not be as diversified as you think.
"Index funds can be a very good way to get into the stock market. It's a lot easier, and cheaper, to buy a few shares of an index fund than it is to buy a few shares in hundreds of different companies. An index fund will also generally charge lower fees than an ""actively managed"" mutual fund, where the manager tries to pick which stocks to invest for you. While the actively managed fund might give you better returns (by investing in good companies instead of every company in the index) that doesn't always work out, and the fees can eat away at that advantage. (Stocks, on average, are expected to yield an annual return of 4%, after inflation. Consider that when you see an expense ratio of 1%. Index funds should charge you more like 0.1%-0.3% or so, possibly more if it's an exotic index.) The question is what sort of index you're going to invest in. The Standard and Poor's 500 (S&P 500) is a major index, and if you see someone talking about the performance of a mutual fund or investment strategy, there's a good chance they'll compare it to the return of the S&P 500. Moreover, there are a variety of index funds and exchange-traded funds that offer very good expense ratios (e.g. Vanguard's ETF charges ~0.06%, very cheap!). You can also find some funds which try to get you exposure to the entire world stock market, e.g. Vanguard Total World Stock ETF, NYSE:VT). An index fund is probably the ideal way to start a portfolio - easy, and you get a lot of diversification. Later, when you have more money available, you can consider adding individual stocks or investing in specific sectors or regions. (Someone else suggested Brazil/Russia/Indo-China, or BRICs - having some money invested in that region isn't necessarily a bad idea, but putting all or most of your money in that region would be. If BRICs are more of your portfolio then they are of the world economy, your portfolio isn't balanced. Also, while these countries are experiencing a lot of economic growth, that doesn't always mean that the companies that you own stock in are the ones which will benefit; small businesses and new ventures may make up a significant part of that growth.) Bond funds are useful when you want to diversify your portfolio so that it's not all stocks. There's a bunch of portfolio theory built around asset allocation strategies. The idea is that you should try to maintain a target mix of assets, whatever the market's doing. The basic simplified guideline about investing for retirement says that your portfolio should have (your age)% in bonds (e.g. a 30-year-old should have 30% in bonds, a 50-year-old 50%.) This helps maintain a balance between the volatility of your portfolio (the stock market's ups and downs) and the rate of return: you want to earn money when you can, but when it's almost time to spend it, you don't want a sudden stock market crash to wipe it all out. Bonds help preserve that value (but don't have as nice of a return). The other idea behind asset allocation is that if the market changes - e.g. your stocks go up a lot while your bonds stagnate - you rebalance and buy more bonds. If the stock market subsequently crashes, you move some of your bond money back into stocks. This basically means that you buy low and sell high, just by maintaining your asset allocation. This is generally more reliable than trying to ""time the market"" and move into an asset class before it goes up (and move out before it goes down). Market-timing is just speculation. You get better returns if you guess right, but you get worse returns if you guess wrong. Commodity funds are useful as another way to diversify your portfolio, and can serve as a little bit of protection in case of crisis or inflation. You can buy gold, silver, platinum and palladium ETFs on the stock exchanges. Having a small amount of money in these funds isn't a bad idea, but commodities can be subject to violent price swings! Moreover, a bar of gold doesn't really earn any money (and owning a share of a precious-metals ETF will incur administrative, storage, and insurance costs to boot). A well-run business does earn money. Assuming you're saving for the long haul (retirement or something several decades off) my suggestion for you would be to start by investing most of your money* in index funds to match the total world stock market (with something like the aforementioned NYSE:VT, for instance), a small portion in bonds, and a smaller portion in commodity funds. (For all the negative stuff I've said about market-timing, it's pretty clear that the bond market is very expensive right now, and so are the commodities!) Then, as you do additional research and determine what sort investments are right for you, add new investment money in the places that you think are appropriate - stock funds, bond funds, commodity funds, individual stocks, sector-specific funds, actively managed mutual funds, et cetera - and try to maintain a reasonable asset allocation. Have fun. *(Most of your investment money. You should have a separate fund for emergencies, and don't invest money in stocks if you know you're going need it within the next few years)." The NYSE 20 Year Plus Treasury Bond Index (AXTWEN) is a multiple-security fixed income index that aims to track the total returns of the long-term 20 year and greater maturity range of the U.S. Treasury bond market. The index constituent bonds are weighted by their relative amounts outstanding.One cannot directly invest in an Index. Index Bond Maturities 24 to 27 Years  20.36% /27 to 29 Years     79.64% Index Duration 17.47 Years An oversimplification of how bonds value changes as rates change is they are inversely related based on the duration of the bond.  Think of duration as the time-weighted average of all the coupons and the final payment. In this case, a drop in rates of about 1% will cause a rise in value of about 17.4%. Long term rates took a drop in the last year. "&gt;""Engineers cant even reliably get a robot to recognize an object like a chair.""  My first thought in response to your statement was that you were wrong, but then I started thinking about the very wide variety of what we consider to be a chair and I realized that thats actually quite true, especially if you include modernist or upholstered chairs in the set of chairs .    However, I think thats a bad example, because not being able to do that particular task reliably and rapidly for another five years or so without spending a huge amount of money isn't going to save any particular jobs that I know of. Because we're not at the stage yet where we need to solve those particular kinds of problems.   The kinds of machine vision problems that are impacting jobs are much more mundane and much easier to solve.  For example, distinguishing between kinds of fruit, produce, etc. in a grocery, or determining visually if fruit is ripe, etc, in various agricultural applications." Bond ETFs are just another way to buy a bond mutual fund.  An ETF lets you trade mutual fund shares the way you trade stocks, in small share-size increments.  The content of this answer applies equally to both stock and bond funds. If you are intending to buy and hold these securities, your main concerns should be purchase fees and expense ratios.  Different brokerages will charge you different amounts to purchase these securities.  Some brokerages have their own mutual funds for which they charge no trading fees, but they charge trading fees for ETFs.  Brokerage A will let you buy Brokerage A's mutual funds for no trading fee but will charge a fee if you purchase Brokerage B's mutual fund in your Brokerage A account. Some brokerages have multiple classes of the same mutual fund.  For example, Vanguard for many of its mutual funds has an Investor class (minimum $3,000 initial investment), Admiral class (minimum $10,000 initial investment), and an ETF (share price as initial investment).  Investor class has the highest expense ratio (ER).  Admiral class and the ETF generally have much lower ER, usually the same number.  For example, Vanguard's Total Bond Market Index mutual fund has Investor class (symbol VBMFX) with 0.16% ER, Admiral (symbol VBTLX) with 0.06% ER, and ETF (symbol BND) with 0.06% ER (same as Admiral).  See Vanguard ETF/mutual fund comparison page.  Note that you can initially buy Investor class shares with Vanguard and Vanguard will automatically convert them to the lower-ER Admiral class shares when your investment has grown to the Admiral threshold. Choosing your broker and your funds may end up being more important than choosing the form of mutual fund versus ETF.  Some brokers charge very high purchase/redemption fees for mutual funds.  Many brokers have no ETFs that they will trade for free.  Between funds, index funds are passively managed and are just designed to track a certain index; they have lower ERs.  Actively managed funds are run by managers who try to beat the market; they have higher ERs and tend to actually fall below the performance of index funds, a double whammy. See also Vanguard's explanation of mutual funds vs. ETFs at Vanguard. See also Investopedia's explanation of mutual funds vs. ETFs in general. "While you have asked for general principles, I am going to seize onto a specific example you gave in order to illustrate the difficulties here: Argentina. Argentina's bonds are probably not safer than US treasuries. Argentina is presently in the business of seizing foreign oil businesses (Repsol YPF) while championing leftist causes. At the very least this indicates an elevated level of political risk: S&P, which affirmed Argentina's ratings five notches into junk territory at B, said policies such as those enacted since the country's October presidential election could also weaken Argentina's macroeconomic framework and external liquidity... ""Actions of this type continue to shorten the economic planning horizon in the country and contribute to Argentina's deteriorating economic and political links with the international community."" -- ""S&P Lowers Argentina Outlook To Negative"". The Wall Street Journal, 23 April 2012 You're not going to be able to capture that sort of a risk with raw budget numbers. It's hard enough to figure out creditworthiness for a business; for an entire nation it's even harder. That's why credit-rating firms, as faulty as they may be, employ dozens of people to try and figure this sort of thing out. Additionally, there is a currency risk associated with buying bonds denominated in foreign currencies. It doesn't matter much if $nation repays all its bonds if they have so much inflation that the repayment is worth half of what it used to be (nor is it much help if your own nation's currency rises in value while your investment's value is stable elsewhere). Ultimately the value of a bond is ""how much money am I actually going to get back?"" and while operating a budget surplus isn't a bad sign in and of itself, it's hardly the complete picture. A fair accounting of the relative creditworthiness of any two nations needs to unite two massive fields of study: Macroeconomics and Politics. It is possible that the right sort of degree in economics, risk management, or a similar field of study could prepare you to know exactly what sort of research is necessary to make a meaningful analysis. :) Now, if you just want some commentary on which bonds are safe to buy, ask a credit-rating agency -- for example, read Standard and Poor's sovereign ratings - or find a mutual fund which may invest in international bonds at its own discretion and have someone else make the decisions." "Yes. S&P/ Case-Shiller real-estate indices are available, as a single national index as well as multiple regional geographic indices. These indices are updated on the last Tuesday of every month. According to the Case-Shiller Index Methodology documentation: Their purpose is to measure the average change in home prices in 20 major metropolitan areas... and three price tiers– low, middle and high. The regional indices use 3-month moving averages, published with a two-month lag. This helps offset delays due to ""clumping"" in the flow of sales price data from county deed recorders. It also assures sufficient sample sizes.  Regional Case-Shiller real-estate indices  * Source: Case-Shiller Real-estate Index FAQ. The S&P Case-Shiller webpage has links to historical studies and commentary by Yale University Professor Shiller. Housing Views posts news and analysis for the regional indices. Yes. The CME Group in Chicago runs a real-estate futures market. Regional S&P/ Case-Schiller index futures and options are   the first [security type] for managing U.S. housing risk. They    provide protection, or profit, in up or down markets. They extend to the   housing industry the same tools, for risk management and investment,    available for agriculture and finance. But would you want to invest? Probably not. This market has minimal activity. For the three markets, San Diego, Boston and Los Angeles on 28 November 2011, there was zero trading volume (prices unchanged), no trades settled, no open interest, see  far right, partially cut off in image below.  * Source: Futures and options activity[PDF] for all 20 regional indices.  I don't know the reason for this situation. A few guesses: Additional reference: CME spec's for index futures and options contracts." Bond MF/ETF comes in many flavour, one way to look at them is corporate, govt. (gilt/sovreign), money market (short term, overnight lending etc.), govt. backed bonds. The ETF/MFs that invest money in these are also different types. One way to evaluate an ETF/MF is to see where they invest your money. Corporate debts are by the highest coupon paying bonds, however, the chance of default is also greater, if you wish to invest in these, it is preferable to look at the ETF/MF's debt portfolio financial ratings (Moodies etc.). Govt. bonds are more stable and unless the govt. defaults (which happens more often than we would like to think), here also look for higher rating bonds portfolio that the fund/scheme carries. The govt. backed bonds are somewhat similar to sovreign bonds, however, these are issuesd by institutions which are backed by govt. (e.g. national railways, municipal bodies etc.), any fund/scheme that invests in these bonds could also be considered and similarly measured. The last are the short term money market related, which provides the least return but are very liquid. It is very difficult to answer how you should invest large sum on ETF/MFs that are bond oriented. However, from any investment perspective, it is better to spread your money. If I take your hypthetical case of 1M$, I would divide it into 100K$ pieces and invest in 10 different ETF/MF schemes of different flavour: Hope this helps. From InvestingAnswers, the price of a bond is equal to the present value of its future cash flows, as shown in the following formula:  Where: By induction, this is equivalent to: or, using more familiar formulae, it is equivalent to the formula for the present value of an ordinary annuity to represent the coupon payments, plus a term for the discounted value at maturity: For example, a 10 year semiannual bond with coupon payment 10%, priced at 1095 with maturity value 1000. Solving for r yields 0.0428332 or 4.28% semi-annually. (8.75% per annum) The solution can be found by plotting or using a solver, which many pocket calculators have.  Plot of p as a function of r, intersecting with p = 1095 when r = 0.0428   Checking on Investopedia