Component stocks in price-weighted indexes are weighted based on their price per share divided by the index's total price. A price-weighted index is a portfolio of stocks that each have one share. Even if the underlying business fundamentals remained intact, a stock split for any index component firm would reduce its weight in the index. Because of this, price-weighted indexes are unsuitable as benchmarks for passive investing. Regardless, price-weighted indices like the Dow Jones Industrial Average and the Nikkei 225 are extensively used as visual market indicators.