Stock market index
An index is a single number that tracks the prices of a chosen group of shares. It is used to describe how a market, or part of it, has moved.
Appears in Why Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day, How Cheap Borrowing in Japan Made the August 2024 Market Selloff Worse, The Nifty's September 2024 High: Why Prices Later Fell, SEBI's October 2024 Index Derivatives Rules, Explained, The April 2025 US Reciprocal Tariffs, Explained for India.
Supporting questions (9)
What does a stock market index such as the Dow measure?
What is the Sensex?
What does a big fall in an index tell us?
explainedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
mentionedHow Cheap Borrowing in Japan Made the August 2024 Market Selloff Worse
explainedThe April 2025 US Reciprocal Tariffs, Explained for India
What does a stock market index like the Sensex show?
How is the percentage fall in an index calculated?
illustratedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
What is a stock market index and what does it track?
What is a stock market index?
explainedThe Nifty's September 2024 High: Why Prices Later Fell
Why can two indices move by different amounts over the same months?
Why can an index’s intraday high or low differ from its closing level?
explainedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
Bull market
A bull market is a long period when share prices mostly rise. The term describes a trend and has no single official definition.
Supporting questions (2)
What is a bull market?
How long and how large must a rise be before it is called a bull market?
Discounting
Discounting converts future payments into a value today using a rate of return. A higher rate gives a lower value for the same future payments.
Supporting questions (2)
Why does a lower safe interest rate raise what the same profit is worth?
What does a simple profit-divided-by-rate valuation leave out?
Re-rating
A re-rating happens when investors pay a higher or lower price for the same profits because conditions around the business have changed.
Appears in Why Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day, The Nifty's September 2024 High: Why Prices Later Fell.
Supporting questions (3)
What is a re-rating of a share?
illustratedThe Nifty's September 2024 High: Why Prices Later Fell
Why can share prices rise before the economy or profits recover?
How can a change in the earnings multiple move a share price even when profit stays unchanged?
illustratedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
explainedThe Nifty's September 2024 High: Why Prices Later Fell
Margin
The part of a purchase's value that a borrower must put in with their own money. A loan without margin lets the borrower take larger positions with less of their own cash.
Appears in How Cheap Borrowing in Japan Made the August 2024 Market Selloff Worse, SEBI's October 2024 Index Derivatives Rules, Explained.
Supporting questions (3)
What is margin in a loan against shares?
How does a margin deposit differ from the price paid for an option?
explainedSEBI's October 2024 Index Derivatives Rules, Explained
How can a demand for extra collateral force a trader to sell investments?
explainedHow Cheap Borrowing in Japan Made the August 2024 Market Selloff Worse
Carry-forward trading (badla)
In a carry-forward system, a trader defers settlement of a trade to a later date, with a financier supplying money or shares for a fee. The position depends on lenders being willing to keep funding it.
Supporting questions (1)
How did carry-forward (badla) trading work in India?
Index options and premium
An index option is a contract whose value depends on a share index. The buyer pays a price, the premium, upfront; the contract's value can change quickly because it has a fixed life.
Appears in SEBI's October 2024 Index Derivatives Rules, Explained.
Supporting questions (2)
How does an option buyer's premium work in a simple rupee example?
illustratedSEBI's October 2024 Index Derivatives Rules, Explained
Why can options carry high implicit leverage even when the buyer pays only a premium?
explainedSEBI's October 2024 Index Derivatives Rules, Explained
Stock index futures
Stock index futures are contracts based on the future value of a share index. They let investors cut or add market exposure without trading each share.
Supporting questions (2)
What are stock index futures and why were they used to cut exposure quickly?
What is an index future, and how does it differ from owning the shares in the index?
Stop-loss order
A stop-loss order tells a broker to sell a share automatically if its price falls to a set level. When many holders use similar levels, their sales can arrive together.
Supporting questions (2)
What is a stop-loss order?
Why can many people holding the same sell rule push prices down together?
Price-to-earnings ratio
The P/E ratio is a share price divided by the company's profit per share. It shows how much investors pay for each rupee of yearly profit, and it is not a payback period.
Appears in Why Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day, The Nifty's September 2024 High: Why Prices Later Fell.
Supporting questions (2)
What does a P/E ratio measure?
illustratedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
explainedThe Nifty's September 2024 High: Why Prices Later Fell
What does a P/E ratio of about 200 mean compared with 20?
Market bubble
A bubble is a period when prices rise far above what expected profits seem to support, often followed by a large fall. Whether a price is too high is a judgement made with hindsight.
Appears in The Nifty's September 2024 High: Why Prices Later Fell.
Supporting questions (2)
Why is a very high price risky when it rests on hoped-for future profit?
mentionedThe Nifty's September 2024 High: Why Prices Later Fell
Can a record index level alone prove that shares were overpriced?
explainedThe Nifty's September 2024 High: Why Prices Later Fell
Foreign portfolio investor
A foreign portfolio investor (FPI) is a registered overseas investor that buys and sells listed Indian securities such as shares and bonds, without taking control of a company. Its net buying or selling is recorded in rupees and can move prices.
Appears in The Nifty's September 2024 High: Why Prices Later Fell.
Supporting questions (2)
What is a foreign portfolio investor, and why can its buying or selling affect Indian share prices?
explainedThe Nifty's September 2024 High: Why Prices Later Fell
How can heavy FPI selling affect both share prices and the rupee?
Herd behaviour in markets
Investors may buy or sell because others are doing so, rather than because of a company's earnings. Regulators have described such trading as sentiment driven.
Supporting questions (1)
How can sentiment, rather than earnings, drive share prices?
Market capitalisation
Market capitalisation is the total market value of a company's listed shares, or of all shares on an exchange. It changes whenever share prices change.
Supporting questions (2)
What is market capitalisation?
How is a company's market capitalisation calculated, and what does a fall in it show?
Market expectations and surprises
Share prices usually reflect what investors broadly expect. A known outcome can still move prices if it differs from those expectations, so the surprise often matters more than the news itself.
Appears in Why Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day, How Cheap Borrowing in Japan Made the August 2024 Market Selloff Worse, The April 2025 US Reciprocal Tariffs, Explained for India, June 2025 Iran-Israel Conflict: Why Oil Rose While Tankers Kept Moving.
Supporting questions (3)
Why can share prices fall when a widely anticipated outcome actually happens?
explainedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
Why can a share fall after a company announces good results?
Why can share prices change before reported business profits change?
illustratedHow Cheap Borrowing in Japan Made the August 2024 Market Selloff Worse
illustratedThe April 2025 US Reciprocal Tariffs, Explained for India
illustratedJune 2025 Iran-Israel Conflict: Why Oil Rose While Tankers Kept Moving
Volatility index (India VIX)
A volatility index, such as NSE's India VIX, is derived from Nifty option prices. It shows how much movement in the Nifty the market expects over the next 30 days; it does not predict direction.
Appears in Why Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day.
Supporting questions (2)
What does a rise in India VIX show about expected market movement?
explainedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
What does a rise in the India VIX tell an investor, and what does it not tell?
Percentage loss and the gain needed to recover
A fall of a given percentage needs a larger percentage rise to return to the starting value. A 50 percent fall needs a 100 percent gain, for example.
Appears in Why Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day, The Nifty's September 2024 High: Why Prices Later Fell.
Supporting questions (2)
Why does a 78 percent fall need a gain of more than 300 percent to recover?
illustratedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
illustratedThe Nifty's September 2024 High: Why Prices Later Fell
How is the percentage gain needed to recover a loss calculated?
illustratedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day
illustratedThe Nifty's September 2024 High: Why Prices Later Fell
Diversification
Diversification means spreading money across different investments so that one disappointing holding does not decide the whole result. It reduces the effect of a single failure but cannot remove the risk of a broad market fall.
Supporting questions (6)
Why does holding many different investments reduce the damage from one failure?
Why does diversification not protect against a fall that hits the whole market?
How does mixing Indian stocks, US stocks, gold and deposits spread risk?
Why can a diversified portfolio still lose money?
Why can one investment beat a diversified mix over a period?
Why can diversification weaken when many markets fall together?
Derivative
A derivative is a contract whose value depends on something else, such as an index, a share or a commodity price. Futures and options are common examples, and they are traded in fixed lots.
Appears in SEBI's October 2024 Index Derivatives Rules, Explained.
Supporting questions (2)
What does a derivative's value depend on, and why is it not owning the asset?
explainedSEBI's October 2024 Index Derivatives Rules, Explained
How can the same derivative be used to reduce risk or to take risk?
Call and put options
A call option gives the buyer the right, not the obligation, to buy at a fixed price by a set date; a put gives the right to sell. The buyer pays a premium, and the most the buyer can lose is that premium, while a seller can lose much more.
Appears in SEBI's October 2024 Index Derivatives Rules, Explained.
Supporting questions (3)
Why is the buyer's maximum loss on an option limited while the seller's is not?
What is the profit or loss on a call option at expiry for three different index levels?
How do calls and puts differ, and why is getting the direction right not enough for a profit?
illustratedSEBI's October 2024 Index Derivatives Rules, Explained
Initial public offering
An IPO is when a company first sells shares to the public and lists on an exchange. The issue price is set by the company and its bankers, and the listing price is then set by the market.
Supporting questions (2)
How does a company raise money through an IPO?
Why can a share list far above or below its issue price?
Dividend
A dividend is a share of a company's profit paid to shareholders. It is decided by the company and is not guaranteed.
Appears in The Nifty's September 2024 High: Why Prices Later Fell.
Supporting questions (2)
What is a dividend, and why is it not guaranteed?
explainedThe Nifty's September 2024 High: Why Prices Later Fell
How is dividend yield calculated?
Earnings per share
Earnings per share is a company's profit divided by its number of shares. It is the profit measure that the price-to-earnings ratio compares with the share price.
Appears in The Nifty's September 2024 High: Why Prices Later Fell.
Supporting questions (2)
How is earnings per share calculated?
How do earnings per share and the share price together give the P/E ratio?
illustratedThe Nifty's September 2024 High: Why Prices Later Fell
Mark to market
Marking to market means valuing a position at today's market price rather than its purchase price. Gains and losses then show up as prices move, even if nothing has been sold.
Appears in Why Silicon Valley Bank Collapsed in 2023: Bond Losses and a Bank Run.
Supporting questions (2)
What does valuing a holding at today's market price show that its purchase price does not?
illustratedWhy Silicon Valley Bank Collapsed in 2023: Bond Losses and a Bank Run
Why do futures traders have to settle gains and losses daily?
US stock market and the S&P 500
The S&P 500 tracks about 500 large US companies and is the common benchmark for the US stock market. Its returns for an Indian investor also depend on the rupee-dollar exchange rate.
Supporting questions (2)
What does the S&P 500 track?
Why can US and Indian stock markets move differently in the same year?
Implied volatility
Implied volatility is inferred from option prices and describes the size of price swings those prices allow for. It is not the actual percentage price change and does not predict direction.
Appears in Why Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day.
Supporting questions (1)
How does implied volatility describe expected price swings rather than an actual price change?
explainedWhy Indian Shares Fell on 4 June 2024, the Lok Sabha Results Day