Okay so here's the deal - I'm going to sweeping all my trading profits into my investment account. I'm 28, and so I won't be touching the money for at least 35 years when I 'retire'. So my timeframe is 35 years. What I'll be doing is buying SPY. I'm going to buy 1 unit of SPY upon every 5% pullback from every new highwater mark. So I define 1 unit as 5k dollars or some other amount that I define. I will never sell. I won't be doing any market timing, or predicting, or chasing the latest hot stocks, or 'taking profits'. I figure the worst case senerio would be a 50% decline in SPY (which as happened only twice in 100 years) - in which case i will have to buy 10 units. Obviously another alternative would be to buy SSO instead of SPY. SSO is a 2x leveraged SPX index tracking etf. But my question is if SPX goes down 50% then how much would SSO go down? As far as diversifying against dollar weakness. I may also buy into emerging market etfs as well and apply the same strategy.