📚 PASS Investment Adviser (Level 1) Difficulty: Intermediate ℹ️ Info   ~5 min read
📌 Chapter 10.8 — Derivative markets, products and strategies

Imagine you are an analyst at a brokerage firm in Mumbai, reviewing the morning screen. You notice that the Nifty futures contract for next month is trading at a significant premium to the spot price, far exceeding the standard 6-month interest rate and cost of carry. Your junior colleague suggests this might simply be a bullish sentiment indicator, but your internal model tells you the spread has widened beyond economic justification.

Recognizing this as a potential mispricing allows you to shift from speculative forecasting to executing a classic cash-and-carry arbitrage strategy.

Arbitrage exists because of the ‘Law of One Price,’ which dictates that the cost of an asset in the spot market and the financing cost to hold it until expiration should equal the futures price. In the Indian market, when the observed futures price is higher than this theoretical value, a ‘mispricing’ occurs. An arbitrageur captures this by simultaneously buying the underlying stock in the cash market and selling the corresponding futures contract.

Since both legs are executed at the same time, the price difference is locked in, effectively neutralizing the risk of underlying market volatility.

This strategy is not about guessing the direction of the market; it is about exploiting market inefficiencies to earn a risk-free return—or ‘alpha’—that exceeds the prevailing risk-free interest rate. If you find the futures price is lower than the fair value, you would initiate a reverse arbitrage: shorting the spot asset and going long on the futures contract.

These trades are the engine of market efficiency, as the collective actions of arbitrageurs quickly force the futures price back toward its theoretical equilibrium, ensuring that spot and futures prices converge precisely at expiration.

For a finance practitioner, identifying these deviations is a critical skill in risk management and portfolio optimization. If your valuation models consistently show that the basis is out of alignment, you can use these discrepancies to hedge institutional portfolios more cheaply or to generate superior yields on idle cash balances. Mastery of this concept allows you to distinguish between genuine market sentiment and temporary technical glitches that the market has yet to correct.1

Nuance

⚠️ Nuance
Candidates often fall into the trap of assuming that the existence of an arbitrage opportunity implies an immediate, risk-free profit without considering transaction costs. In reality, brokerage commissions, Securities Transaction Tax (STT), and the cost of borrowing capital for the cash leg can quickly erode small price discrepancies. A professional analyst must calculate the ’net’ arbitrage profit after these frictions; if the theoretical profit is less than the total cost of execution, the perceived opportunity is merely a market illusion.

Check Your Understanding

Practice Question 1

A trader observes that the theoretical futures price of a stock is Rs. 1,050, while the actual market futures price is Rs. 1,070. Given that transaction costs are negligible, what action should the trader take to exploit this discrepancy?

Practice Question 2

Which of the following scenarios describes a condition where arbitrage is NOT viable despite a price difference between spot and futures markets?

This is a companion read for Section 10.8 — Derivative markets, products and strategies from PASS Investment Adviser (Level 1) by Akhilesh Gururani, available on Amazon Kindle.

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  1. The ‘basis’ is defined as the difference between the spot price and the futures price. A positive basis occurs when the spot price exceeds the futures price, often seen in markets with supply constraints or high dividend yields. ↩︎