What is Price-Weighted Index?

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A Price-Weighted Index is a type of stock index where the weight of each constituent company is proportional to its stock's price per share. The index is calculated by summing the prices of all the constituent stocks and dividing by the total number of constituent stocks. Consequently, higher-priced stocks have a more significant impact on the index.

Definition

A price-weighted index is a stock index where each company's weight in the index is proportional to its stock price per share. The index is calculated by adding up the prices of all constituent stocks and then dividing by the total number of constituents. Therefore, stocks with higher prices have a greater impact on the index.

Origin

The concept of a price-weighted index dates back to the late 19th century when Charles Dow and Edward Jones created the Dow Jones Transportation Average in 1884, one of the earliest price-weighted indices. Since then, this method has been widely applied in other markets.

Categories and Features

The main features of a price-weighted index are its simplicity and sensitivity to high-priced stocks. It does not consider a company's market capitalization or the number of shares outstanding, which can lead to significant changes due to fluctuations in individual high-priced stocks. Common examples of price-weighted indices include the Dow Jones Industrial Average.

Case Studies

The Dow Jones Industrial Average is one of the most well-known price-weighted indices. In 2015, Apple Inc. was added to the index, and due to its high stock price, it had a significant impact on the index. Another example is the Nikkei 225, where high-priced stocks like Fast Retailing have a substantial influence on the index's movements.

Common Issues

Investors often misunderstand the performance of price-weighted indices, believing they fully reflect market conditions. In reality, due to their bias towards high-priced stocks, they may mislead about the overall market performance. Additionally, stock splits affect the index calculation, requiring divisor adjustments.

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