Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Does it make sense to buy an index ETF (e.g. S&P 500) when the index is at an all-time high?
Being long the S&P Index ETF you can expect to make money. The index itself will never "crash" because the individual stocks in it are simply removed when they begin performing badly. This is not to say that the S&P Index won't lose 80% of its value in an instant (or over a few trading sessions if circuit breakers are considered), but even in the 2008 correction, the S&P still traded far above book value. With this in mind, you have to realize, that despite common sentiment, the indexes are hardly representative of "the market". They are just a derivative, and as you might be aware, derivatives can enable financial tricks far removed from reality. Regarding index funds, if a small group of people decide that 401k's are performing badly, then they will simply rebalance the components of the indexes with companies that are doing well. The headline will be "S&P makes ANOTHER record high today" So although panic selling can disrupt the order book, especially during periods of illiquidity, with the current structure "the stock market" being based off of three composite indexes, can never crash, because there will always exist a company that is not exposed to broad market fluctuations and will be performing better by fundamentals and share price. Similarly, you collect dividends from the index ETFs. You can also sell covered calls on your holdings. The CBOE has a chart through the 2008 crisis showing your theoretical profit and loss if you sold calls 2 standard deviations out of the money, at every monthly interval. If you are going to be holding an index ETF for a long time, then you shouldn't be concerned about its share price at all, since the returns would be pretty abysmal either way, but it should suffice for hedging inflation.