OK I'll be more specific. The S&P traded at a PE of 33 in 1999. Now it is at a PE of 20. It would be awesome if we shot back up to 33.
As far as preparing for a downturn I am really not prepared. I only prepare mentally:
1) First, I know that it is normal and can happen and I should not be surprised if and when it happens.
2) I am prepared to reduce expenses so that I can put more money into stocks during a downturn and I might even take on some extra debt to make that happen if the market is down to historically low PE levels.
Now, if my portfolio continues to grow as fast as it has for the last 18 months I will start getting more defensive and holding fewer individual stocks and more index funds. If it keeps going even further I might even start buying some bonds.
Not sure how holding index funds helps in the downturn. They are all likely to go down in the event of market turnaround. And going down might be much faster than going up.
Some serious paranoid traders hold gold, not in gold stocks, they hold real gold bricks in safes.
In Australia, real estate is a good market (stocks) hedge, but not in US. That can change.
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Bitcoin is my hedge against government mucking up the economy or the USD failing
It will be interesting to see how bitcoin story unfolds. Might work out ok to be a new type of hedge.