The problem with our culture and economy is that we live off of bubbles. Bubbles are like playing hot potato. Someone (usually the last one to get in on it) will be left holding the bag.
Epic_Alien has an idea. Land, food, other barter, and the will and means to protect it are the only things that will have worth in a SHTF scenario.
Whether it happens or not remains to be seen. My gut says a long depression is more likely than full-on hell on earth Mad Max.
Playing with stocks is like a more complex version of gambling. So, if you're gonna play the market, don't go in half-a$$ed and know you've a good chance of getting your ass handed back to you.