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Looking for suggestions for relatively safe instruments if another crash were to happen
Nobody has a "crash proof" portfolio -- you can make it "crash resistant". You protect against a crash by diversifying and not reacting out of fear when the markets are down. Be careful about focusing on the worst possible scenario (US default) vs. the more likely scenarios. Right now, many people think that inflation and interest rates are heading up -- so you should be making sure that your bond portfolio is mostly in short-duration bonds that are less sensitive to rate risk. Another risk is opportunity cost. Many people sold all of their equities in 2008/2009, and are sitting on lots of money in cash accounts. That money is "safe", but those investors lost the opportunity to recoup investments or grow -- to the tune of 25-40%.