Index Investing

See: Index Fund. And note that, typically, fund managers are measured against a given index, like, say, the S&P 500. That index might have 11% industrials (companies like GE, Dow and behemoths who...make stuff). In index investing, the focus revolves around the relative weightings or indices that a given "bogey" proffers. So an index investor in an S&P 500-measured fund might decide to over-or-under-weight her index and exposure to industrials...but its weighting would begin at that 11% of the total number, and go fatter or thinner depending on the lean. Or the fat.