Most of us rely on indicators (plus accumulated knowledge) to make our predictions. It doesn't matter if you a trend trader looking for a long run or a scalper looking to pick up a few quick ticks. We are relying on historical data to predict the future.
I've been getting the feeling lately that I'm relying too much on "old" data and put myself through a little experiment. My chart is squeezed down to show no more than 1/2 hour of past prices and I'm only allowed to use 1 indicator. My conclusion is "Wow", that changed my world.
So my questions is this: if you're only allowed 1 indicator what would it be?