take a list of 1 million people. tell half that a particular stock will go up and half that a particular stock will go down. discard the 500,000 that you were

take a list of 1 million people. tell half that a particular stock will go up and half that a particular stock will go down. discard the 500,000 that you were wrong to and do it again, tell 250,000 that a particular stock will go up and the other half that it will go down. Repeat a few times until you have only a few thousand people left whom think you have been right 7 or 8 times in a row. Tell them you are a stock guru and will teach them your system for $10,000. Profit.