What is Price-weighted Index?

Legal Definition
A price-weighted index is a stock market index where each constituent makes up a fraction of the index that is proportional to its component, the value would be:

  • Adjustment Factor= Index specific constant "Z"/(Number of shares of the stock*Adjusted stock market value before rebalancing)

A stock trading at $100 will thus be making up 10 times more of the total index compared to a stock trading at $10.

The Dow Jones Industrial Average and Nikkei 225 are examples of price-weighted stock market indexes.
-- Wikipedia
Legal Definition
An index wherein the value of the index is affected proportionally to the market price of the share of the constituent stocks.