{"concept":{"id":7,"slug":"market-capitalization","term":"Market capitalization","shortDefinition":"The total market value of all of a company's shares -- the result of multiplying a share's price by the total number of shares outstanding.","longDefinition":"Market capitalization is not the same as \"the value of the company\": it's an estimate based on what the market is willing to pay for its shares at a given moment, which can differ from book value or the intrinsic value a fundamental analysis would estimate. It's the standard measure for classifying companies by size (large-, mid-, or small-cap) and for weighting many stock market indices -- the larger a company's market cap, the more weight it typically carries in the index calculation."},"relations":{"requirement":[],"contrast":[],"related":[],"calculatedBy":[{"concept":{"id":6,"slug":"share","term":"Share","shortDefinition":"A security that represents a proportional part of a company's ownership -- whoever holds it is a part-owner of that company, in the proportion that share represents of the total.","longDefinition":"Buying a share is not lending money to the company (that's what bonds are): it's acquiring a portion of its ownership. As a shareholder, you're entitled to a proportional part of the profits if the company pays dividends, and in principle to a vote at the shareholders' meeting -- although in practice that vote carries little weight if your stake is small compared to other shareholders. A share's value isn't set by the company: it's determined by the market, through the same supply-and-demand mechanism that sets the price of any asset in a financial market."}},{"concept":{"id":5,"slug":"stock-market-index","term":"Stock market index","shortDefinition":"An indicator that summarizes, in a single number, the combined performance of a specific group of stocks -- usually the most representative ones on an exchange, in a country, or in a sector.","longDefinition":"An index is not a stock you can buy directly: it's an aggregate measure, calculated according to each index's own rules (which companies it includes, how it weights each one, how often it reviews its composition). It serves as a quick benchmark for market performance and as a comparison point for portfolios and funds, but it doesn't measure a country's economy as a whole, nor does it include every company listed on an exchange."}},{"concept":{"id":72,"slug":"ev-ebitda","term":"EV/EBITDA","shortDefinition":"A multiple that compares a company's full value -- market cap plus net debt -- with its EBITDA, neutralizing the effect of its financing structure.","longDefinition":"EV/EBITDA compares a company's Enterprise Value -- its full value, calculated by adding net financial debt to market capitalization, already covered in Level 1 -- with its EBITDA, a variant of operating income, already covered in Level 2, that adds back depreciation and amortization. Unlike the P/E ratio, EV/EBITDA neutralizes the effect of how the company is financed -- the same spirit that led ROIC, already covered in Level 2, to look at total invested capital instead of equity alone -- which lets you compare companies with very different debt levels."}}]},"curricularPosition":[{"id":5,"moduleId":2,"slug":"what-are-stock-market-indices","title":"What are stock market indices?","summary":"You recognize the main stock market indices, what they're used for as an aggregate benchmark, and what they do NOT measure.","bodyMarkdown":"## Objectives\n\nBy the end of this lesson you recognize the main stock market indices, what they're used for as an aggregate benchmark, and what they do NOT measure.\n\n## Content\n\nA stock market index is an indicator that summarizes, in a single number, the combined performance of a specific group of stocks -- usually the most representative ones on an exchange, in a country, or in a sector. It isn't a stock you can buy directly: it's an aggregate measure, calculated from the price -- and sometimes other variables, like market capitalization -- of the companies that make it up.\n\nEach index has its own rules: which companies it includes, how it weights each one (they don't all carry the same weight in the calculation -- companies with a larger market cap tend to carry more weight), and how often its composition is reviewed. That's why two indices from the same exchange, or from different exchanges, aren't directly comparable without knowing their rules.\n\nAn index serves as a quick benchmark -- \"did the market go up or down today?\" -- and as a comparison point for evaluating whether a portfolio or a fund did better or worse than the market as a whole. But it's important to be precise about what an index does NOT measure: it doesn't measure a country's \"economy\" as a whole -- an economy has sectors, employment, and consumption that don't reduce to a handful of listed companies -- and it doesn't include every company listed on an exchange, only the ones that meet the index's selection criteria.\n\n## Example\n\nThe IBEX 35 groups the 35 largest companies listed on the Spanish exchange by market cap and liquidity; the S&P 500 does the same with 500 large U.S. companies. If the IBEX 35 rises on a given day, it doesn't mean all 35 companies rose -- it means the group as a whole, weighted according to the index's rules, rose.\n\n## Common mistakes\n\n- Confusing an index's performance with a country's \"economy\" as a whole -- an index measures a specific group of listed companies, not all economic activity.\n- Assuming that every company on an exchange is in its main index -- an index only includes the ones that meet its selection criteria, such as size or liquidity.\n\n## Summary\n\nA stock market index summarizes, in a single number, the combined performance of a specific group of stocks, selected and weighted according to each index's own rules. It serves as a quick market benchmark, but it doesn't measure the economy as a whole, nor does it include every listed company.\n\n## Self-check\n\nWhy can't you buy \"an index\" directly, as if it were a stock?\n\nWhat's the difference between an index rising and every company on that exchange rising?","bodyHtml":"

Objectives

\n

By the end of this lesson you recognize the main stock market indices, what they're used for as an aggregate benchmark, and what they do NOT measure.

\n

Content

\n

A stock market index is an indicator that summarizes, in a single number, the combined performance of a specific group of stocks -- usually the most representative ones on an exchange, in a country, or in a sector. It isn't a stock you can buy directly: it's an aggregate measure, calculated from the price -- and sometimes other variables, like market capitalization -- of the companies that make it up.

\n

Each index has its own rules: which companies it includes, how it weights each one (they don't all carry the same weight in the calculation -- companies with a larger market cap tend to carry more weight), and how often its composition is reviewed. That's why two indices from the same exchange, or from different exchanges, aren't directly comparable without knowing their rules.

\n

An index serves as a quick benchmark -- "did the market go up or down today?" -- and as a comparison point for evaluating whether a portfolio or a fund did better or worse than the market as a whole. But it's important to be precise about what an index does NOT measure: it doesn't measure a country's "economy" as a whole -- an economy has sectors, employment, and consumption that don't reduce to a handful of listed companies -- and it doesn't include every company listed on an exchange, only the ones that meet the index's selection criteria.

\n

Example

\n

The IBEX 35 groups the 35 largest companies listed on the Spanish exchange by market cap and liquidity; the S&P 500 does the same with 500 large U.S. companies. If the IBEX 35 rises on a given day, it doesn't mean all 35 companies rose -- it means the group as a whole, weighted according to the index's rules, rose.

\n

Common mistakes

\n\n

Summary

\n

A stock market index summarizes, in a single number, the combined performance of a specific group of stocks, selected and weighted according to each index's own rules. It serves as a quick market benchmark, but it doesn't measure the economy as a whole, nor does it include every listed company.

\n

Self-check

\n

Why can't you buy "an index" directly, as if it were a stock?

\n

What's the difference between an index rising and every company on that exchange rising?

","sortOrder":4,"readingMinutes":5,"difficulty":"Básico","url":"/en/academy/fundamentals/introduction-to-markets/what-are-stock-market-indices"}],"graphSummary":{"root":{"type":"concept","id":"7","depthFromRoot":0,"entity":{"type":"concept","slug":"capitalizacion-bursatil","term":"Capitalización bursátil","excerpt":"Valor total de mercado de todas las acciones de una empresa -- resulta de multiplicar el precio de una acción por el número total de acciones en circulación."}},"depth":1,"returnedNodes":1,"truncated":false,"hasCycle":false,"nodes":[{"type":"concept","id":"7","depthFromRoot":0,"entity":{"type":"concept","slug":"capitalizacion-bursatil","term":"Capitalización bursátil","excerpt":"Valor total de mercado de todas las acciones de una empresa -- resulta de multiplicar el precio de una acción por el número total de acciones en circulación."}}],"edges":[]},"relatedNews":[],"relatedEntities":[]}