“Investing for long periods in cash is not desirable. But in the short run cash is like an option over every asset class, with no expiration date and no strike price. Cash provides the option to sweep up a bargain when it becomes available and this must have some value above the fact it earns almost nothing. If the purpose of an investment portfolio is to grow as well as protect the wealth you’ve accumulated over the years, doesn’t it make sense, if you can afford it, to also hold an option?” – Roger Montgomery