Breadth Thrust Indicator

A technical analysis tool intended to predict shifts in investor sentiment based upon the amount of advancing or declining stocks in an index, as a percentage of the entire index.

Marty knows that there are approximately 500 stocks in the S&P 500 Index. Every trading day for a year, Marty counts how many of those stocks trade up, and divides each of those numbers by 500. Marty notices that, between days 167 and 177, the number moved from less than 40% to more than 61.5%, so he bought an S&P 500 Index Fund.

Marty has no life. But now, because of his Breadth Thrust Indicator, Marty has a lot more money. You win some, you lose some.