Arbitrage

Arbitrage is a trading strategy that profits from price differences of the same or equivalent assets in different markets. In theory, arbitrage is risk-free profit—you buy low in one market and simultaneously sell high in another. In practice, pure arbitrage opportunities are rare and fleeting because sophisticated traders with fast technology quickly eliminate price discrepancies.

How Arbitrage Works

Arbitrage profits from market inefficiencies:

Simple Arbitrage Example:
Stock XYZ trades at:
- NYSE: $100.00
- NASDAQ: $100.05

Arbitrage Trade:
1. Buy 10,000 shares on NYSE at $100.00 = $1,000,000
2. Sell 10,000 shares on NASDAQ at $100.05 = $1,000,500
3. Net profit: $500 (risk-free)

Reality: This opportunity lasts milliseconds
and requires massive capital for meaningful profit.

Quick Reference: Types of Arbitrage

Type	Description	Complexity
Simple/Spatial	Same asset, different exchanges	Basic concept
Cash-Futures	Spot vs. futures price difference	Moderate
Triangular	Currency cross-rate inefficiencies	Complex
Statistical	Mean-reverting pairs/portfolios	Advanced
Merger	Announced deal price vs. current price	Event-driven

Example: Cash-Futures Arbitrage

Setup: Nifty spot vs. Nifty futures

Observation:

• Nifty Spot: 21,000
• Nifty Futures (1-month): 21,200
• Fair Value (with carry cost): 21,150

Opportunity: Futures overpriced by 50 points

Arbitrage Trade:

1. Sell Nifty futures at 21,200
2. Buy equivalent basket of Nifty stocks at 21,000
3. Hold until expiration (futures = spot)
4. Profit: 200 points minus carry costs

Return: 50 points / 21,000 = 0.24% in one month (2.9% annualized)

Types of Arbitrage Explained

1. Spatial Arbitrage

Same asset trading at different prices on different exchanges. Requires fast execution to capture.

2. Cash-and-Carry

Buying spot and selling futures when futures are overpriced relative to carrying costs. Common in commodities and equity indices.

3. Triangular Arbitrage

Exploiting inconsistencies in currency cross-rates. If USD/INR × INR/EUR ≠ USD/EUR, there’s an opportunity.

4. Merger Arbitrage

Buying target company after acquisition announcement at a discount to the deal price. Risk: deal may fail.

5. Statistical Arbitrage

Trading pairs of historically correlated securities when their relationship diverges. Not truly risk-free.

Why Pure Arbitrage Is Rare

1. Technology Arms Race

High-frequency traders with microsecond execution close arbitrage gaps instantly.

2. High Capital Requirements

Small price differences require huge positions for meaningful profit.

3. Transaction Costs

Commissions, spreads, and fees can exceed the arbitrage profit.

4. Execution Risk

The gap may close before you complete both legs of the trade.

5. Competition

Thousands of sophisticated players hunt the same opportunities.

Quasi-Arbitrage for Retail Traders

While pure arbitrage is inaccessible, retail traders can pursue:

• Pairs Trading: Trade mean reversion between correlated stocks
• Calendar Spreads: Trade price relationships between different expiration options
• Cash-Futures Spread: Trade when futures diverge from fair value
• ETF Arbitrage: Trade when ETF price diverges from NAV

These carry more risk than pure arbitrage but offer more realistic opportunities.

Common Mistakes

1. Underestimating execution risk – If you can’t execute both sides simultaneously, it’s not arbitrage—it’s speculation.

2. Ignoring transaction costs – Small arbitrage profits can be consumed by commissions and spreads.

3. Calling any trade “arbitrage” – If you’re taking directional risk, it’s not arbitrage. True arbitrage is non-directional.

4. Overestimating opportunities – Markets are efficient. If you see “free money,” question what you’re missing.

How JournalPlus Tracks Arbitrage

JournalPlus can track paired positions for quasi-arbitrage strategies, calculating spread P&L and measuring the relationship between your simultaneous long and short positions over time.