A price-weighted index is a stock market index where each constituent makes up a fraction of the index that is proportional to its price. For a stock market index this implies that stocks are included in proportions based on their quoted prices. A stock trading at $100 will thus be making up 10 times more of the total index compared to a stock trading at $10. This is different from a market weighted index where stocks are included based on the equity market values of the underlying companies, i.e. the quoted stock price multiplied by the number of shares outstanding.