NISM-Series-XV: Research Analyst · Fundamentals of Research

Market Efficiency and Investment Concepts for NISM Research Analyst

Q: What are the three forms of the efficient market hypothesis?

Weak form says prices reflect past price and volume data. Semi-strong form says prices reflect all public information. Strong form says prices reflect all public and private information.

Q: What is the difference between intrinsic value and market price?

Market price is the current traded price. Intrinsic value is an analyst's estimate of worth based on fundamentals such as cash flows, growth and risk. The gap between them guides buy or sell views.

Q: Does market efficiency make research analysts unnecessary?

Not entirely. If markets were fully efficient, analysis would add little. In practice, efficiency varies, and analysts seek mispricing, especially in less-followed stocks, while also explaining value and risk to investors.

Q: Does higher risk guarantee higher return?

No. Investors demand higher expected return for taking higher risk, but actual returns can be lower or even negative. Risk is the uncertainty of outcomes.

Updated 11 October 2026 · Fact-checked

The efficient market hypothesis (EMH) says prices reflect available information. Weak form: past prices. Semi-strong form: all public information. Strong form: public and private information. Intrinsic value is what an asset is worth from fundamentals; market price is what it trades at. Higher expected return needs higher risk. Match each statement to its form to solve questions.

Understand Market Efficiency and Investment Concepts

Every security has a market price, which is where buyers and sellers meet today. It also has an intrinsic value, which is an analyst's estimate of worth based on cash flows, growth and risk. A research analyst looks for gaps between the two. If price is below intrinsic value, the security looks undervalued. If price is above, it looks overvalued.

The efficient market hypothesis asks how quickly and fully prices absorb information. In an efficient market, new information is reflected in prices fast, so price changes come mainly from new, unexpected news. News is random, so price changes are hard to predict.

There are three forms. Weak form: prices already reflect all past price and volume data, so chart patterns cannot give consistent excess returns. Semi-strong form: prices reflect all publicly available information, including past prices, financial statements, announcements and news. Both technical and fundamental analysis of public data would fail to give consistent excess returns. Strong form: prices reflect all information, public and private (insider). Even insiders could not earn excess returns. Each form includes the one before it.

Risk is the uncertainty of returns, meaning the chance that actual return differs from expected return. Return is the gain or loss on an investment, from price change and income such as dividends or interest. The basic principle is the risk-return tradeoff: investors need a higher expected return to accept higher risk. It is an expectation, not a guarantee. Higher risk can also give lower or negative actual returns.

This shapes research. If markets are fully efficient, analysis adds little. If markets are not fully efficient, careful analysis of information, valuation and risk may find mispriced securities. Markets are generally seen as more efficient for large, widely followed stocks and less efficient for small, thinly traded ones. Anomalies and behavioural biases are cited as evidence against full efficiency.

Key formulas to remember

Weak form EMH: Price reflects all past prices and volumes; Technical analysis cannot give consistent excess returns. Fundamental analysis may still work.
Semi-strong form EMH: Price reflects all public information; Technical and fundamental analysis of public data cannot give consistent excess returns. Only private information may help.
Strong form EMH: Price reflects all public and private information; Even insider information gives no advantage. Trading on it is also illegal in India.
Nesting of forms: Weak ⊂ Semi-strong ⊂ Strong; If a stronger form holds, the weaker forms hold too.
Valuation signal: Intrinsic value > market price → undervalued; intrinsic value < market price → overvalued; Intrinsic value is an estimate and depends on assumptions.
Total return: Total return = (Ending price − Beginning price + Income) ÷ Beginning price; Income means dividends or interest received during the period.
Risk-return tradeoff: Higher risk → higher expected return required; It concerns expected return, not assured return.

How to solve Market Efficiency and Investment Concepts questions

Use this method for any question on market efficiency, risk-return or intrinsic value versus price.

1Read the question and spot the key word: past prices, public information, private information, price, value, risk or return.
2If it is about EMH, identify the information set mentioned: past prices means weak, public means semi-strong, private or insider means strong.
3Ask which analysis the form defeats: weak defeats technical analysis, semi-strong defeats technical and fundamental analysis, strong defeats all.
4If it is about value, compare intrinsic value with market price and decide undervalued, overvalued or fairly valued.
5If it is about risk and return, apply the tradeoff: higher risk needs higher expected return, with no guarantee.
6If numbers are given, compute total return using price change plus income over beginning price.
7Check each option for absolute words like always or guaranteed, and eliminate the ones that overstate.

Quickest way: Information-set match

When to use it: Use for any EMH form question when time is short.

Match the information set: past prices = weak, public = semi-strong, private = strong.
Remember the ladder: each stronger form includes the weaker ones.
Pick the option naming the form whose information set matches the statement exactly.
For value questions, simply compare intrinsic value and price.

Common mistakes in Market Efficiency and Investment Concepts

Saying weak form efficiency means fundamental analysis is useless.
Students treat all forms as ruling out all analysis.
Fix: Weak form rules out only technical analysis based on past prices. Fundamental analysis may still help.
Confusing semi-strong with strong form.
Both mention information, and the words public and private look alike.
Fix: Semi-strong is public only. Strong adds private or insider information.
Treating intrinsic value as a fact.
The word value sounds exact.
Fix: Intrinsic value is an estimate that depends on assumptions about cash flows, growth and risk. Different analysts can reach different values.
Assuming higher risk always gives higher return.
The tradeoff is learned as a slogan.
Fix: Higher risk means higher expected return is required. Actual outcomes may be lower or negative.
Thinking an efficient market means prices never change or are never wrong.
Efficiency is mixed up with stability.
Fix: Prices keep changing as new information arrives. Efficiency means they reflect available information quickly, so changes are hard to predict.
Ignoring income when computing return.
Students look only at price change.
Fix: Add dividends or interest received to the price gain before dividing by the beginning price.

Worked examples

Example 1

Studies show that investors cannot earn consistent excess returns using published financial statements, news and chart patterns, but corporate insiders do earn such returns. Which form of the efficient market hypothesis is supported? (a) Weak form only (b) Semi-strong form (c) Strong form (d) No form

Show the solution

Public information such as financial statements and news gives no consistent excess return, so prices reflect public information.
Chart patterns use past prices, which are also covered.
Insiders still earn excess returns, so private information is not reflected in price.
Public information is reflected but private is not, which is the semi-strong form.

Answer: (b) Semi-strong form

Example 2

A share was bought at ₹200 and sold a year later at ₹230 after receiving a dividend of ₹10. Compute the total return. Its analyst estimates intrinsic value at ₹260 while the price at purchase was ₹200. What does this suggest?

Show the solution

Price gain = ₹230 − ₹200 = ₹30.
Income = ₹10, so total gain = ₹30 + ₹10 = ₹40.
Total return = ₹40 ÷ ₹200 = 0.20, that is 20%.
Intrinsic value of ₹260 is above the price of ₹200, so the share looked undervalued at purchase, subject to the accuracy of the estimate.

Answer: Total return is 20%. The share looked undervalued at purchase.

Exam tips

Questions often give a short statement and ask which EMH form it fits. Match the information set first.
Watch for absolute words such as always, guaranteed or never. They usually mark wrong options.
Remember what each form says about technical and fundamental analysis. This is a favourite trap.
Treat risk-return statements as expectations. Options promising returns for higher risk are wrong.
With negative marking, skip a question only if you cannot narrow the options to two.

Practice questions from Fundamentals of Research

Market Efficiency and Investment Concepts in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Market Efficiency and Investment Concepts: frequently asked questions

What are the three forms of the efficient market hypothesis?

Weak form says prices reflect past price and volume data. Semi-strong form says prices reflect all public information. Strong form says prices reflect all public and private information.

What is the difference between intrinsic value and market price?

Market price is the current traded price. Intrinsic value is an analyst's estimate of worth based on fundamentals such as cash flows, growth and risk. The gap between them guides buy or sell views.

Does market efficiency make research analysts unnecessary?

Not entirely. If markets were fully efficient, analysis would add little. In practice, efficiency varies, and analysts seek mispricing, especially in less-followed stocks, while also explaining value and risk to investors.

Does higher risk guarantee higher return?

No. Investors demand higher expected return for taking higher risk, but actual returns can be lower or even negative. Risk is the uncertainty of outcomes.