Why would I want a diversified portfolio, versus throwing my investments into an index fund?
"Index funds are well-known to give the best long-term investment. Not exactly. Indexes give the best long term performance when compared to actively managing investments directly in the underlying stocks. That is, if you compare an S&P500 index to trying to pick stocks that are part of it, you're more likely to succeed with blindly following the index than trying to actively beat it. That said, no-one promises that investing in S&P500 is better than investing in DJIA, for example. These are two different indexes tracking different stocks and areas. So when advisers say ""diversify"" they don't mean it that you should diversify between different stocks that build up the S&P500 index. They mean that you should diversify your investments in different areas. Some in S&P500, some in DJIA, some in international indexes, some in bond indexes, etc. Still, investing in various indexes will likely yield better results than actively managing the investments trying to beat those indexes, but you should not invest in only one, and that is the meaning of diversification. In the comments you asked ""why diversify at all?"", and that is entirely a different question from your original ""what diversification is?"". You diversify to reduce the risk of loss from one side, and widen the net for gains from another. The thing is that any single investment can eventually fail, regardless of how it performed before. You can see that the S&P500 index lost 50% of its value twice within ten years, whereas before it was doubling itself every several years. Many people who were only invested in that index (or what's underlying to it) lost a lot of money. But consider you've diversified, and in the last 20 years you've invested in a blend of indexes that include the S&P500, but also other investments like S&P BSE SENSEX mentioned by Victor below. You would reduce your risk of loss on the American market by increasing your gains on the Indian market. Add to the mix soaring Chinese Real Estate market during the time of the collapse of the US real-estate, gains on the dollar losing its value by investing in other currencies (Canadian dollar, for example), etc. There are many risks, and by diversifying you mitigate them, and also have a chance to create other potential gains. Now, another question is why invest in indexes. That has been answered before on this site. It is my opinion that some methods of investing are just gambling by trying to catch the wave and they will almost always fail, and rarely will individual stock picking beat the market. Of course, after the fact its easy to be smart and pick the winning stocks. But the problem is to be able to predict those charts ahead of time." "Diversification is extremely important and the one true ""Free Lunch"" of investing, meaning it can provide both greater returns and less risk than a portfolio that is not diversified. The reason people say otherwise is because they are talking about ""true"" portfolio diversification, which cannot be achieved by simply spreading money across stocks. To truly diversify a portfolio it must be diversified across multiple, unrelated ""Return Drivers."" I describe this throughout my best-selling book and am pleased to provide complimentary links to the following two chapters, where I discuss the lack of diversification from spreading money solely across stocks (including correlation tables), as well as the benefits of true portfolio diversification: Jackass Investing - Myth #8: Trading is Gambling – Investing is Safer Jackass Investing - Myth #20: There is No Free Lunch" Index funds are well-known to give the best long-term investment. Are they? Maybe not all the time! If you had invested in an index fund tracking the S&P500 at the start of 2000 you would still be behind in terms of capital appreciation when taking inflation into considerations. Your only returns in 13.5 years would have been any dividends you may have received. See the monthly chart of the S&P500 below.  Diversification can be good for your overall returns, but diversification simply for diversification sake is as you said, a way of reducing your overall returns in order of smoothing out your equity curve. After looking up indexes for various countries the only one that had made decent returns over a 13.5 year period was the Indian BSE 30 index, almost 400% over 13.5 years, although it also has gone nowhere since the end of 2007 (5.5 years). See monthly chart below.  So investing internationally (especially in developing countries when developed nations are stagnating) can improve your returns, but I would learn about the various international markets first before plunging straight in. Regarding investing in an Index fund vs direct investment in a select group of shares, I did a search on the US markets with the following criteria on the 3rd January 2000:  If the resulting top 10 from the search were bought on 3rd January 2000 and held up until the close of the market on the 19th June 2013, the results would be as per the table below:  The result, almost 250% return in 13.5 years compared to almost no return if you had invested into the whole S&P 500 Index. Note, this table lists only the top ten from the search without screening through the charts, and no risk management was applied (if risk management was applied the 4 losses of 40%+ would have been limited to a maximum of 20%, but possibly much smaller losses or even for gains, as they might have gone into positive territory before coming back down - as I have not looked at any of the charts I cannot confirm this). This is one simple example how selecting good shares can result in much better returns than investing into a whole Index, as you are not pulled down by the bad stocks.
This advice will be too specific, but... With the non-retirement funds, start by paying off the car loan if it's more than ~3% interest rate. The remainder: looks like a good emergency fund. If you don't have one of those yet, you do now. Store it in the best interest-bearing savings account you can find (probably accessible by online banking). If you wish to grow your emergency fund beyond $14-20,000 you might also consider some bonds, to boost your returns and add a little risk (but not nearly as much risk as stocks). With the Roth IRA - first of all, toss the precious metals. Precious metals are a crisis hedge and an advanced speculative instrument, not a beginner's investment strategy for 40% of the portfolio. You're either going to use this money for retirement, or your down payment fund. If it's retirement: you're 28; even with a kid on the way, you can afford to take risks in the retirement portfolio. Put it in either a targe-date fund or a series of index funds with an asset allocation suggested by an asset-allocation-suggestion calculator. You should probably have north of 80% stocks if it's money for retirement. If you're starting a down-payment fund, or want to save for something similar, or if you want to treat the IRA money like it's a down-payment fund, either use one of these Vanguard LifeStrategy funds or something that's structured to do the same sort of thing. I'm throwing Vanguard links at you because they have the funds with the low expense ratios. You can use Vanguard at your discretion if it's all an IRA (and not a 401(k)). Feel free to use an alternative, but watch the expense ratios lest they consume up to half your returns. "Yes, the ""based on"" claim appears to be true – but the Nobel laureate did not personally design that specific investment portfolio ;-) It looks like the Gone Fishin' Portfolio is made up of a selection of low-fee stock and bond index funds, diversified by geography and market-capitalization, and regularly rebalanced.  Excerpt from another article, dated 2003: The Gone Fishin’ Portfolio  [circa 2003] Vanguard Total Stock Market Index (VTSMX) – 15%   Vanguard Small-Cap Index (NAESX) – 15%   Vanguard European Stock Index (VEURX) – 10%   Vanguard Pacific Stock Index (VPACX) – 10%   Vanguard Emerging Markets Index (VEIEX) – 10%   Vanguard Short-term Bond Index (VFSTX) – 10%   Vanguard High-Yield Corporates Fund (VWEHX) – 10%   Vanguard Inflation-Protected Securities Fund (VIPSX) – 10%   Vanguard REIT Index (VGSIX) – 5%   Vanguard Precious Metals Fund (VGPMX) – 5%   That does appear to me to be an example of a portfolio based on Modern Portfolio Theory (MPT), ""which tries to maximize portfolio expected return for a given amount of portfolio risk"" (per Wikipedia).  MPT was introduced by Harry Markowitz, who did go on to share the 1990 Nobel Memorial Prize in Economic Sciences.  (Note: That is the economics equivalent of the original Nobel Prize.) You'll find more information at NobelPrize.org - The Prize in Economics 1990 - Press Release. Finally, for what it's worth, it isn't rocket science to build a similar portfolio.  While I don't want to knock the Gone Fishin' Portfolio (I like most of its parts), there are many similar portfolios out there based on the same concepts.  For instance, I'm reminded of a similar (though simpler) portfolio called the Couch Potato Portfolio, made popular by MoneySense magazine up here in Canada. p.s. This other question about asset allocation is related and informative." Note that many funds just track indexes. In that case, you essentially don't have to worry about the fund manager making bad decisions. In general, the statistics are very clear that you want to avoid any actively managed fund. There are many funds that are good all-in-one investments. If you are in Canada, for example, Canadian Couch Potato recommends the Tangerine Investment Funds. The fees are a little high, but if you don't have a huge investment, one of these funds would be a good choice and appropriate for 100% of your investment. If you have a larger investment, to the point that Tangerine's MER scares you a little, you still may well look at a three or four fund (or ETF) portfolio. You may choose to use an actively-managed fund even though you know there's virtually no chance it'll beat a fund that just tracks an index, long-term. In that case, I'd recommend devoting only a small portion of your portfolio to this fund. Many people suggest speculating with no more than 10% of your combined investment. Note that other people are more positive on actively-managed funds. "From http://blog.ometer.com/2008/03/27/index-funds/ , Lots of sensible advisers will tell you to buy index funds, but   importantly, the advice is not simply ""buy index funds.""   There are at least two other critical details: 1) asset allocation   across multiple well-chosen indexes, maintained through regular   rebalancing, and 2) dollar cost averaging (or,   much-more-complex-but-probably-slightly-better, value averaging). The   advice is not to take your single lump sum and buy and hold a   cap-weighted index forever. The advice is an investment   discipline which involves action over time, and an initial   choice among indexes. An index-fund-based   strategy is not completely passive, it involves some active risk   control through rebalancing and averaging. If you'd held a balanced portfolio over the last ten years and rebalanced, and even better if you'd dollar cost averaged, you'd have done fine. Your reaction to the last 10 years incidentally is why I don't believe an almost-all-stocks allocation makes sense for most people even if they're pretty young. More detail in this answer: How would bonds fare if interest rates rose? I think some index fund advocacy and books do people a disservice by focusing too much on the extra cost of active management and why index funds are a good deal.  That point is true, but for most investors, asset allocation, rebalancing, and ""autopilotness"" of their setup are more important to outcome than the expense ratio." "Generally investing in index-tracking funds in the long term poses relatively low risk (compared to ""short term investment"", aka speculation). No-one says differently. However, it is a higher risk than money-market/savings/bonds. The reason for that is that the return is not guaranteed and loss is not limited. Here volatility plays part, as well as general market conditions (although the volatility risk also affects bonds at some level as well). While long term trend may be upwards, short term trend may be significantly different. Take as an example year 2008 for S&P500. If, by any chance, you needed to liquidate your investment in November 2008 after investing in November 1998 - you might have ended up with 0 gain (or even loss). Had you waited just another year (or liquidated a year earlier) - the result would be significantly different. That's the volatility risk. You don't invest indefinitely, even when you invest long term. At some point you'll have to liquidate your investment. Higher volatility means that there's a higher chance of downward spike just at that point of time killing your gains, even if the general trend over the period around that point of time was upward (as it was for S&P500, for example, for the period 1998-2014, with the significant downward spikes in 2003 and 2008). If you invest in major indexes, these kinds of risks are hard to avoid (as they're all tied together). So you need to diversify between different kinds of investments (bonds vs stocks, as the books ""parrot""), and/or different markets (not only US, but also foreign)." "Over on Quantitative Finance Stack Exchange, I asked and answered a more technical and broader version of this question, Should the average investor hold commodities as part of a broadly diversified portfolio?  In short, I believe the answer to your question is that gold is neither an investment nor a hedge against inflation. Although many studies claim that commodities (such as gold) do offer some diversification benefit, the most credible academic study I have seen to date, Should Investors Include Commodities in Their Portfolios After All? New Evidence, shows that a mean-variance investor would not want to allocate any of their portfolio to commodities (this would include gold, presumably). Nevertheless, many asset managers, such as PIMCO, offer funds that are marketed as ""real return"" or ""inflation-managed"" and include commodities (including gold) in their portfolios.  PIMCO has also commissioned some research, Strategic Asset Allocation and Commodities, claiming that holding some commodities offers both diversification and inflation hedging benefits." Keep it simple, three fund portfolio...  Just because you have a lot of money doesn't mean you have to consult an advisor.  Post your situation to boggleheads forum.  And yes, don't get a mortgage if you can afford to pay in cash. Hedging - You have an investment and are worried that the price might drop in the near future. You don't want to sell as this will realise a capital gain for which you may have to pay capital gains tax. So instead you make an investment in another instrument (sometimes called insurance) to offset falls in your investment.  An example may be that you own shares in XYZ. You feel the price has risen sharply over the last month and is due for a steep fall. So you buy some put option over XYZ. You pay a small premium and if the price of XYZ falls you will lose money on the shares but will make money on the put option, thus limiting your losses. If the price continues to go up you will only lose the premium you paid for the option (very similar to an insurance policy). Diversification - This is when you may have say $100,000 to invest and spread your investments over a portfolio of shares, some units in a property fund and some bonds. So you are spreading your risks and returns over a range of products. The idea is if one stock or one sector goes down, you will not lose a large portion of your investment, as it is unlikely that all the different sectors will all go down at the same time.