How Does the Index Broaden Our Horizons?



Can a single stock tell you about the state of an entire industry or economy? Probably not. A stock usually reflects the performance of a company compared to other related companies. So, how do we broaden our horizons to understand broader market conditions? Instead of analyzing each stock individually, we construct a cross-section of the entire economy by combining stocks into an index.

Indices are not abstract concepts. Indices allow a broader view of an economy and its overall level of activity, while simultaneously reflecting and visualizing market trends as a whole. Instead of reflecting the performance of a single company, they show the price action of a group of companies at the same time. You may already be familiar with some of the most well-known indices, as they are often used by the news media to describe the overall performance of the stock market.

Major benchmark indices such as the famous Dow Jones Industrial Average, S&P 500, FTSE 100, DAX 30 are globally recognized indices that provide us with valuable insights into how investors perceive economic activity at a given point in time information. Because these major indices represent many companies at the same time, they help us develop a more comprehensive view of the economy and whether they are outperforming or underperforming other comparable benchmarks.


Shares are priced based on forward-looking forecasts, which means we price based on expectations of growth or decline in the company's future performance. When company performance, breaking news, dividend payouts or other important news are released, investors will react immediately to all publicly available information, which affects stock prices. That means they make decisions about whether to buy or sell based on this new information and how it might affect future performance.

Stock indices are effective barometers of where the economy is headed because we price stocks based on expectations for the future. In contrast to certain economic indicators such as gross domestic product (GDP) or employment, which are measures of past economic performance and are therefore lagging indicators of current activity, stock indices give us insight into future performance. When companies provide revenue forecasts, we gain a better understanding of how they view future performance.

Since the index is made up of many stocks, we can get a clear picture of how investors view the economy as a whole. Indices typically represent stocks of the largest companies in various sectors of the economy. The index not only represents tech stocks, but also industrials, retail, transportation, etc., giving us a broader perspective.

Indices may be global (S&P 100), regional (Stoxx 50), or national (Dow Jones Industrial Average). The index can be calculated according to several different methods. Some are price-weighted, meaning only price movements in the constituents affect the valuation of the index (like the Dow Jones Industrial Average), while others are capital-weighted, meaning the size of the companies that make up the constituents affects their weight in the index. For example, the S&P 500 is made up of the 500 largest U.S. companies by market capitalization. Market capitalization is defined as the price of a stock multiplied by the number of shares outstanding. Constituent companies are added or removed over time depending on their performance, with those that do not meet certain minimum capitalization thresholds being replaced by more capitalized companies.


Global stock exchanges are home to thousands of listed companies. Analyzing every company is a time-consuming process that requires a lot of research time. Trying to choose which is better and which is underperforming is a daunting task, challenging even for professional investors. Fortunately, indexes can simplify this process and reduce costs, rather than buying and selling each stock in the index individually. One of the easiest ways to diversify your portfolio and avoid the heavy task of analyzing each company is to invest in an index. While returns may not be as high as those of fast-growing companies, the index may not fall as much as the worst-performing stocks.