How can you profit from economic collapse?

Say you know a certain currency will be worthless in a few years.  How do you exploit the situation for maximum benefit?

rape

Find out what successful people in Japan did when they had their lost decade.

I take it that, by "a certain currency", you mean the U.S. dollar?

Short sell stocks if you think stocks are going down.

Buy a diversified portfolio of currencies that'll stay strong.  Then when your target currency gets to rock bottom (when it can only go up), convert your portfolio all to that currency.

GOLD

>>6
Gold is already too expensive to make a profit on.  If you had bought it several years back you'd be sitting on some fat cash right now.  But with it sitting near 1000 an ounce there's not a ton of profitability left.

sell guns during the time of anarchy. Build a new empire and proclaim yourself King of America. I and thousands like myself will rally to your cause. We shall push down through mexico and conquer south america for the glory and the gold!