Empirical performance data of ETFs and Mutual Funds tracking identical Indexes?
Why don't you look at the actual funds and etfs in question rather than seeking a general conclusion about all pairs of funds and etfs?  For example, Vanguard's total stock market index fund (VTSAX) and ETF (VTI).  Comparing the two on yahoo finance I find no difference over the last 5 years visually.  For a different pair of funds you may find something very slightly different.   In many cases the index fund and ETF will not have the same benchmark and fees so comparisons get a little more cloudy.  I recall a while ago there was an article that was pointing out that at the time emerging market ETF's had higher fees than corresponding index funds.  For this reason I think you should examine your question on a case-by-case basis.  Index fund and ETF returns are all publicly available so you don't have to guess.
"An ETF does not track any one individual stock. It ""is a marketable security that tracks an index, a commodity, bonds, or a basket of assets like an index fund."" Check out this link to learn more about ETFs. The easiest way see what ETF tracks a stock is to determine what sector and industry that company is in and find some ETF that trade it. The ETF will likely trade that stock, assuming that its market cap and exchange it trades on fits within the parameters of the ETF." "Are there other options I haven't thought of? Mutual funds, stocks, bonds. To buy and sell these you don't need a lawyer, a real-estate broker and a banker. Much more flexible than owning real estate. Edit: Re Option 3: With no knowledge of investing the first thing you should do is read a few books. The second thing you should do is invest in mutual funds (and/or ETFs) that track an index, such as the FTSE graph that was posted. Index funds are the safest way to invest for those with no experience. With the substantial amount that you are considering investing it would also be wise to do it gradually. Look up ""dollar cost averaging.""" There's a few different types of investments you could do. As poolie mentioned, you could split your money between the Vanguard All World ex-US and Vanguard Total Stock Market index. A similar approach would be to invest in the Vanguard Total World Stock ETF. You wouldn't have to track separate fund performances, at the downside of not being able to allocate differential amounts to the US and non-US markets (Vanguard will allocate them by market cap). You could consider investing in country-specific broad market indices like the S&P 500 and FTSE 100. While not as diversified as the world indices, they are more correlated with the country's economic outlook. Other common investing paradigms are investing in companies which have historically paid out high dividends and companies that are under-valued by the market but have good prospects for future growth. This gets in the domain of value investing, which an entire field by itself. Like Andrew mentioned, investing in a mutual fund is hassle-free. However, mutual fees/commissions and taxes can be higher (somewhere in the range 1%-5%) than index funds/ETF expense ratios (typically <0.50%), so they would have to outperform the market by a bit to break-even. There are quite a few good books out there to read up about investing. I'd recommend The Intelligent Investor and Millionaire Teacher to understand the basics of long-term investing, but of course, there are many other equally good books too. American Century has their Heritage Fund: https://www.americancentury.com/sd/mobile/fund_facts_jstl?fund=30 It has a good track record.  Here are all the mutual funds from American Century: https://www.americancentury.com/content/americancentury/direct/en/fund-performance/performance.html A mutual fund is a good wayway to go as it is not subject to fluctuations throughout the day whereas an ETF is. The closest I can think of from the back of my head is http://finviz.com/map.ashx, which display a nice map and allows for different intervals. It has different scopes (S&P500, ETFs, World), but does not allow for specific date ranges, though. ETF is essentially a stock, from accounting perspective. Treat it as just another stock in the portfolio. The S&P500 is an index, not an investment by itself.  The index lists a large number of stocks, and the value of the index is the price of all the stocks added together. If you want to make an investment that tracks the S&P500, you could buy some shares of each stock in the index, in the same proportions as the index.  This, however, is impractical for just about everyone. Index mutual funds provide an easy way to make this investment.  SPY is an ETF (exchange-traded mutual fund) that does the same thing. An index CFD (contract for difference) is not the same as an index mutual fund.  There are a number of differences between investing in a security fund and investing in a CFD, and CFDs are not available everywhere. The mutual fund will price at day's end, while the ETF trades during the day, like a stock. If you decide at 10am, that some event will occur during the day that will send the market up, the ETF is preferable. Aside from that, the expenses are identical, a low .14%. No real difference especially in a Roth.