NISM Series X-A · Chapter 8: Investing in Stocks

L1 · Foundation

Foundation — Equity as an investment, diversification and the six risks

Why equity differs from debt, the residual claim, cross-sectional versus time diversification and counter-cyclical businesses, and the six risks of equity investing from market risk through currency risk.

13 min read · Worth 5% of the paper · Written from pages 134–151 of the official NISM workbook · Updated 18 September 2026

8.1 Equity as an investment

"EQUITY securities are issued by companies providing OWNERSHIP to the investor... and DEBT securities are issued by companies providing the RIGHTS OF A LENDER. The features of both these securities DIFFER DUE TO THE INHERENT DIFFERENCE IN THE CLAIM of the investors on the company".

"Equity investors, also known as shareholders, have RESIDUAL CLAIM in the business" — defined in the chapter's footnote as "claim on the company's NET ASSETS, i.e. the value of assets AFTER ALL LIABILITIES HAVE BEEN PAID".

What the company is NOT obliged to do:

"NOT CONTRACTUALLY OBLIGATED TO REPAY THE AMOUNT it receives from the shareholders".
"NOT CONTRACTUALLY OBLIGATED TO MAKE PERIODIC PAYMENTS to shareholders for the use of their funds, LIKE INTEREST PAYMENTS IN THE CASE OF LENDERS".

What shareholders get: "Equity investors get VOTING RIGHTS. When equity investors own a SIZABLE AMOUNT of shares, they get an opportunity to PARTICIPATE IN THE MANAGEMENT of the business".

"Investors who purchase equity shares look for CAPITAL APPRECIATION AND DIVIDEND INCOME. THERE IS NO ASSURANCE OF EITHER by the company. While DIVIDEND payment depends on the PROFITABILITY of the company, CAPITAL APPRECIATION depends on the CONDITIONS OF THE STOCK MARKET".

The trade-off

"Investors desiring LOWER RISK choose DEBT, AT THE COST OF LOWER BUT STABLE RETURNS. However, if they seek HIGHER RETURNS they choose EQUITY investment, BUT THEY MAY NOT BE ABLE TO EARN IT WITHOUT TAKING ON THE ADDITIONAL RISK".

"Most investors tend to ALLOCATE THEIR CAPITAL BETWEEN THESE TWO CHOICES, depending on their EXPECTED RETURN, their INVESTING TIME PERIOD, their RISK APPETITE AND THEIR NEEDS".

8.2 Diversification — cross sectional versus time series

"Equity is INHERENTLY RISKIER compared to bonds and many other asset classes. However, there are ways to mitigate the risks... The MOST MEANINGFUL WAY TO RISK REDUCTION IS THROUGH DIVERSIFICATION — both on CROSS SECTIONAL (i.e. ACROSS BUSINESS SECTORS AND INDUSTRIES) as well as on TIME SERIES basis (i.e. ACROSS VARIOUS TIME PERIODS)".

"Conceptually, it is achieved due to the RELATIVELY LESS CORRELATED BEHAVIOUR of various business sectors which underlie each equity investment. This is what the old adage 'DON'T PUT ALL YOUR EGGS IN ONE BASKET' means".

Type	Definition
Cross sectional	"reducing risk by HOLDING EQUITIES IN MANY DIFFERENT KINDS OF BUSINESSES AT A POINT IN TIME and also ACROSS VARIOUS GEOGRAPHIES OF THE WORLD"
Time series	"requires INVESTING IN EQUITIES FOR A LONG PERIOD OF TIME. The belief is that BAD TIMES WILL GET CANCELLED OUT BY GOOD TIMES"

Business cycles and counter-cyclical businesses

"Underlying the word 'diversification' is the concept of BUSINESS CYCLES AND COUNTER-CYCLICAL BUSINESSES, and the phenomenon of LAG AND LEAD between the behaviour of investment returns and countries' economic performance".

Term	Meaning
Counter-cyclical / defensive	"Some businesses may be AT PEAK WHEN THE BUSINESS CYCLE IS IN ITS TROUGH"
Recession-proof	"Businesses that DO BETTER IN A RECESSION"
Leading sectors	"products, sectors or countries that COME OUT OF A RECESSION FASTER THAN OTHERS"
Lagging sectors	"products, sectors or countries that GO INTO RECESSION LATER THAN OTHERS"

8.3 The six risks of equity investment

8.3.1 Market risk

"arise due to the FLUCTUATIONS IN THE PRICES OF EQUITY SHARES due to VARIOUS MARKET RELATED DYNAMICS. These factors AFFECT ALL THE LISTED, MARKET-TRADED ASSETS, IRRESPECTIVE OF THEIR BUSINESS SECTOR. The DEGREE OF IMPACT MAY BE DIFFERENT".

8.3.2 Sector specific risk

"NOT part of market risks. These risks CAN BE DIVERSIFIED AWAY by investing in DIFFERENT BUSINESS SECTORS... Such risks are also called 'IDIOSYNCRATIC RISKS'".

The chapter's example: "if there are restrictions on the movement of INTERNATIONAL TOURISTS, the AIRLINE INDUSTRY AND HOSPITALITY INDUSTRY are going to be affected. But industries and business sectors DEPENDENT ON DOMESTIC CUSTOMERS ARE NOT AFFECTED".

8.3.3 Company specific risk

"also NON-MARKET RISKS. These risks can ALSO BE DIVERSIFIED AWAY by investing in DIFFERENT COMPANIES".

"Though, overall, the airline industry goes through turbulent times, CERTAIN AIRLINES WITHSTOOD THE ROUGH WEATHER AND OTHER EXITED HELPLESSLY. Such corporate debacles are due to COMPANY SPECIFIC FACTORS. Same is now being seen in TELECOM SECTOR".

8.3.4 Transactional risk

"Risks due to the OTHER PARTY NOT FULFILLING THE TERMS OF THE CONTRACT while buying or selling equities... "This can happen when the other person is either NOT ABLE TO PAY THE MONEY OR DELIVER THE SHARES".

"This type of risk can be MITIGATED BY TRANSACTING THROUGH THE STOCK EXCHANGE where there are ROBUST RISK MITIGATION PROCEDURES".

8.3.5 Liquidity risk

"the risk of NOT BEING ABLE TO FIND A BUYER OR SELLER for the equity holdings. LIQUIDITY RISK IS MEASURED BY IMPACT COST".

"Less liquid stocks are MORE THINLY TRADED, and a SINGLE LARGE TRADE CAN MOVE THEIR PRICES CONSIDERABLY. Such stocks have HIGH IMPACT COSTS. A LOWER MARKET IMPACT IMPLIES THE STOCK IS MORE LIQUID".

8.3.6 Currency risk

"Prima facie it appears that currency risk is NOT DIRECTLY RELATED to prices of equity. However, ONCE THE FINANCIAL MARKETS ARE OPEN TO THE INTERNATIONAL INVESTORS CURRENCY RISK SETS IN".

"arises due to UNCONTROLLABLE, UNPREDICTABLE AND VOLATILE EXCHANGE RATES. When a significant proportion of players belong to the INTERNATIONAL INSTITUTIONAL INVESTORS groups, then that financial market is BOUND TO BE RELATED TO EXCHANGE RATE MOVEMENTS".

"the stock market REACTS TO FPIs' BUY AND SELL PRESSURE, and FPIs MOVE IN AND MOVE OUT of a country with CHANGES IN THEIR HOME COUNTRY INTEREST RATES, or due sudden UNFAVOURABLE EXCHANGE RATE MOVEMENTS, LIKE DEEP DEPRECIATIONS... or due to any other socio-politico-economic, industry or market shocks".

"Apart from the above most prominent risks, ALL OTHER MACRO-ECONOMIC FACTORS LIKE INFLATION, FUEL PRICES, INTEREST RATES, ECONOMIC GROWTH, ECONOMIC SLOWDOWN, DO INFLUENCE STOCK MARKETS".

8.4 Overview of the equity market

"The equity market provides VARIOUS CHOICES to investors in terms of RISK-RETURN-LIQUIDITY PROFILE. There are opportunities in LISTED AS WELL AS UNLISTED equity space".

"Investments in LISTED companies are RELATIVELY MORE LIQUID than investment in UNLISTED companies. Listed companies have to ABIDE BY THE LISTING NORMS, making this investment space MORE REGULATED WITH BETTER DISCLOSURES".

8.5 Equity research and stock selection

"Equity research primarily means ANALYSING THE COMPANY'S FINANCIALS AND NON-FINANCIAL INFORMATION, studying the DYNAMICS OF THE SECTOR the company belongs to, COMPETITORS of the company, ECONOMIC CONDITIONS etc".

"Analysts use FUNDAMENTAL ANALYSIS — TOP-DOWN APPROACH OR BOTTOM-UP APPROACH — QUANTITATIVE SCREENS, TECHNICAL INDICATORS etc., to select stocks".

8.5.1 Buy side versus sell side research

	Sell-side analysts	Buy-side analysts
Work for	"firms that provide INVESTMENT BANKING, BROKING, ADVISORY SERVICES FOR CLIENTS"	"FUND MANAGERS like those of MUTUAL FUNDS, HEDGE FUNDS, PENSION FUNDS, or PORTFOLIO MANAGERS"
Output	"PUBLISH research reports... with specific recommendation to BUY, HOLD, OR SELL, including earnings expectations and a PRICE TARGET"	"generate recommendations FOR THEIR INTERNAL CONSUMPTION, circulated among TOP MANAGEMENT / INVESTMENT MANAGERS of the employer firm"
Paid for	"providing USEFUL INFORMATION TO BE ACTED UPON"	"their INVESTMENT RECOMMENDATIONS"
Expectation	"BROAD GUIDANCE ON MULTIPLE SECTORS, RATHER THAN ACCURATE PRICE PREDICTIONS"	"need to be MORE ACCURATE"

Think of it like this

Equity is a promise of nothing, which is why it must pay more

The chapter states the company's obligations to shareholders as a list of what it is not obliged to do: not to repay the capital, and not to make periodic payments... like interest payments in the case of lenders. Neither dividend nor appreciation is assured. Everything the shareholder receives is what remains after every other claim has been met — which is exactly why "it is usually expected that the RETURN TO EQUITY INVESTORS SHOULD BE HIGHER THAN THAT OF THE DEBT INVESTORS." The higher expected return is compensation for standing last in the queue.

Time IN the market, not timing the market

The chapter's formulation of time diversification is unusually memorable: investing for a long period works because "BAD TIMES WILL GET CANCELLED OUT BY GOOD TIMES. This is why TIME IN THE MARKET is suggested for equity investment AS AGAINST TIMING THE MARKET." Cross-sectional diversification spreads you across sectors and geographies at one moment; time diversification spreads you across moments. Both work for the same underlying reason — the things you own do not all suffer at once.

Market risk is the one you cannot diversify away

The six risks split cleanly on this one test. Market risk "affects ALL the listed, market-traded assets, IRRESPECTIVE of their business sector", and so "CANNOT BE DIVERSIFIED AWAY, THOUGH IT CAN BE HEDGED", with beta as its proxy measure. Sector risk and company risk are explicitly "non-market risks" that "CAN BE DIVERSIFIED AWAY" by spreading across sectors and companies. Diversification is a cure for the specific, not the systematic.

Idiosyncratic risk, illustrated by a tourism ban

Sector-specific risk is also called "idiosyncratic risk", and the chapter grounds it well: restrict international tourist movement and "the AIRLINE INDUSTRY AND HOSPITALITY INDUSTRY are going to be affected. But industries and business sectors DEPENDENT ON DOMESTIC CUSTOMERS ARE NOT AFFECTED." Then company risk sits one level lower: within that same battered airline industry, "certain airlines WITHSTOOD the rough weather and other EXITED HELPLESSLY." Same shock, same sector, opposite fates — that difference is company-specific.

Impact cost measures how much your own order moves the price

Liquidity risk gets a precise metric. Impact cost is "the PERCENTAGE PRICE MOVEMENT CAUSED BY A PARTICULAR ORDER SIZE — let's say Rs 1 lakh — FROM THE AVERAGE OF THE BEST BID AND OFFER PRICE." Try to buy a thinly traded stock and you push the price up against yourself before the order fills. Hence: "Less liquid stocks are MORE THINLY TRADED, and a SINGLE LARGE TRADE CAN MOVE THEIR PRICES CONSIDERABLY. Such stocks have HIGH IMPACT COSTS." It is calculated on both buy and sell sides.

The rupee affects your shares even if you never leave India

Currency risk looks irrelevant to a domestic equity investor — "prima facie it appears that currency risk is NOT DIRECTLY RELATED to prices of equity" — until you notice who sets prices at the margin. "FPIs MOVE IN AND MOVE OUT of a country with CHANGES IN THEIR HOME COUNTRY INTEREST RATES, or due sudden UNFAVOURABLE EXCHANGE RATE MOVEMENTS, LIKE DEEP DEPRECIATIONS." When a large share of the buying power is foreign, the exchange rate becomes an input into your portfolio whether you own dollars or not.

Sell side sells guidance; buy side has to be right

The distinction turns on who pays and for what. Sell-side analysts "are paid for providing USEFUL INFORMATION TO BE ACTED UPON", and what is expected of them is "BROAD GUIDANCE ON MULTIPLE SECTORS, RATHER THAN ACCURATE PRICE PREDICTIONS." Buy-side analysts write only for their own fund managers and "need to be MORE ACCURATE", because "they are paid for their INVESTMENT RECOMMENDATIONS" — recommendations their own employer will act on with real money.

The point of all research is one comparison

Amid economy, industry and company analysis, the chapter never loses sight of the purpose: "The IDEA BEHIND EQUITY RESEARCH IS TO COME UP WITH INTRINSIC VALUE OF THE STOCK TO COMPARE WITH MARKET PRICE and then decide WHETHER TO BUY OR HOLD OR SELL." Everything else — the GDP forecast, the industry life cycle, the SWOT, the ratios — feeds one number, which is then held against one other number that anyone can read off a screen.

Key terms in this chapter

Asset based valuation: Valuing a firm at the adjusted current market values of its net tangible, intangible, financial and net current assets, with equity being firm value less outsider liabilities. It ignores future profits and value creation.
Bollinger bands: Bands using normal distribution to measure deviation of price from the moving average. Two standard deviations above suggests overbought, two below suggests oversold.
Buy-side analyst: An analyst working for a fund manager or portfolio manager, generating recommendations for internal consumption and paid for those recommendations, so needing to be more accurate.
Corporate governance: The cornerstone of qualitative evaluation of a business. Failures manifest as corporate fraud, accounting scandals and excessive compensation, sometimes ending in bankruptcy.
Counter-cyclical business: A business that may be at its peak when the business cycle is in its trough. Also called defensive. Businesses that do better in a recession are called recession-proof.
Cross sectional diversification: Reducing risk by holding equities in many different kinds of businesses at a point in time and across various geographies.
Defensive and offensive strategy: A defensive strategy positions the firm to deflect competitive forces; an offensive strategy uses the firm's strengths to affect those forces.
Defensive industries: Consumer staples such as pharmaceuticals and FMCG, which outperform in a recession because people still spend on necessities.
Discounted Cash Flow: A valuation approach appropriate when the stream of future cash flows, their timings, and the investors' expected rate of return are known.
Dividend yield: Dividend per share divided by market price, times 100. It shows the return from dividend for an investor buying at the current market price.
Earnings yield: Earnings per share divided by market price, times 100. It is the inverse of the P/E ratio.
Economic Value Added (EVA): True economic profit, computed as net after-tax operating profit minus invested capital multiplied by the percentage cost of capital.
EIC framework: The commonly used fundamental approach considering economic, industry and company factors. Top-down runs from macro to company; bottom-up from company upwards.
Enterprise Value: Market capitalisation of equity plus market value of debt minus excess cash and cash equivalents. It measures capital committed to the revenue-generating enterprise, or the cash needed to acquire it.
EV/EBITDA: A multiple extremely useful for highly capital intensive firms not yet making book profits at PAT or EBIT level but generating surplus at the EBITDA level.
Fundamental analysis: Determining intrinsic value from the fundamentals driving it, then buying if market price is below that value and selling if above, after allowing for transaction costs.
Idiosyncratic risk: Sector specific risk, arising from factors affecting businesses in a particular sector. Unlike market risk, it can be diversified away by investing across sectors.
Impact cost: The percentage price movement caused by a particular order size from the average of the best bid and offer price. Calculated for both buy and sell sides; a lower impact cost means a more liquid stock.
Industry life cycle: Introduction (modest sales, small or negative profit), growth (few firms, high margins), maturity (the longest stage, growth matching the economy, high competition) and deceleration and decline (falling sales, pressured margins).
Intrinsic value: The value of a stock based on evaluation and analysis, as distinct from market price. Price is a fact but value is an opinion, and valuation is an art as well as a science.
Leading and lagging sectors: Leading sectors come out of a recession faster than others; lagging sectors go into recession later than others.
Leading economic indicator: A measure that improves before the actual economy does. The stock market is one, because stock price decisions reflect expectations of future economic activity rather than past or current activity.
Market risk: Risk from price fluctuations affecting all listed market-traded assets irrespective of sector. Beta is its proxy measure. It cannot be diversified away, though it can be hedged.
Market Value Added (MVA): The difference between the current market value of a firm and the original capital contributed by investors. Positive means value added, negative means value destroyed.
Moving average analysis: The most popular technical indicator, typically over 5, 10, 30, 50, 100 and 200 days. A simple strategy buys when price is sufficiently below the average and sells when sufficiently above.
PEG ratio: The P/E ratio divided by the earnings growth rate, usually over 5 years. Below 1 suggests undervaluation, 1 fair value and above 1 overvaluation.
P/E ratio: Stock price divided by earnings per share, telling how much an investor is willing to invest per rupee of earnings. Trailing uses the last four quarters, forward the expected next four, and current the most recent annual EPS.
Price to Book Value: Market price per share divided by book value of equity per share. Widely used for banks and financial services, where assets are expected to be marked to market.
P/S ratio: Market capitalisation divided by total sales over the past 12 months. Useful where earnings may be manipulated, where the company is not yet profitable, or in high volume low margin businesses.
Residual claim: The equity shareholder's claim on the company's net assets, being the value of assets after all liabilities have been paid.
Sell-side analyst: An analyst at an investment banking, broking or advisory firm who publishes research with buy, hold or sell recommendations and price targets, paid for providing useful information rather than accurate price predictions.
SWOT analysis: Examination of strengths and weaknesses, which are internal to the company, and opportunities and threats, which are external situations the company is exposed to.
Technical analysis: Forecasting price direction by studying patterns in historical price and volume data, on the assumption that all information affecting a stock is already reflected in its price.
Time diversification: Reducing risk by investing in equities for a long period, on the belief that bad times will be cancelled out by good times. Hence the advice to seek time in the market rather than timing the market.
Transactional risk: The risk of the other party not fulfilling the contract by failing to pay money or deliver shares. Mitigated by transacting through a stock exchange with robust risk procedures.

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Original explanatory writing based on the official NISM workbook for Series X-A, which is published and copyrighted by NISM. Check figures against the current edition at nism.ac.in.

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