Economics

Arbitrage

Published Mar 22, 2024

Definition of Arbitrage

Arbitrage is a trading strategy that involves buying a financial instrument or commodity in one market and simultaneously selling it in another market at a higher price. This difference in prices allows the arbitrager to make a profit on the spread between the two markets. Arbitrage opportunities typically arise from market inefficiencies and are considered risk-free profits for traders who can execute them quickly and efficiently, as the prices in different markets will eventually converge.

Example

Consider a situation where a share of a particular company is being traded at $100 on the New York Stock Exchange (NYSE) but at the same time is available for $99.90 on the London Stock Exchange (LSE). An arbitrager can buy the share for $99.90 on the LSE and simultaneously sell it for $100 on the NYSE, making a profit of $0.10 per share on this transaction. The profit, in this case, arises from the price differential and not from the intrinsic value of the stock, and the strategy relies on the efficiency and speed at which the arbitrager can execute the buy and sell orders.

Why Arbitrage Matters

Arbitrage plays a crucial role in financial markets by ensuring that prices do not deviate substantially from their fair value for long periods. By taking advantage of price discrepancies across different markets or instruments, arbitrageurs help to maintain market efficiency. This process aids in the integration of global financial markets, ensuring that prices reflect all available information and eliminating opportunities for unearned profit. Moreover, the pursuit of arbitrage opportunities can reveal information about market sentiment, liquidity, and the effectiveness of trading mechanisms.

Frequently Asked Questions (FAQ)

Is arbitrage legal?

Yes, arbitrage is a legal and encouraged practice in most financial markets. It provides liquidity and helps maintain price efficiency across different markets. However, arbitrages involving insider information or market manipulation are strictly prohibited and punishable by law.

Can anyone engage in arbitrage?

While theoretically anyone can engage in arbitrage, in practice, it often requires sophisticated technology, immediate access to financial data, substantial capital, and the ability to execute trades rapidly. Institutional investors, such as hedge funds, banks, and proprietary trading firms, are typically the most active in arbitrage due to their resources.

What are some common types of arbitrage?

There are several types of arbitrage, including:

  • Statistical arbitrage: Exploits statistical mispricing of one or more assets based on the expected value of these assets.
  • Merge arbitrage: Capitalizes on price discrepancies between a company’s stock price and the expected price after a merger is completed.
  • Fixed-income arbitrage: Takes advantage of differences in interest rates or price discrepancies between different bonds or securities.
  • Currency arbitrage: Exploits the price differences of currencies in various markets or formats, like spot versus futures prices.

What are the risks associated with arbitrage?

Although arbitrage is considered risk-free in theory, in practice, there are several risks, including execution, counterparty, and liquidity risks. Execution risk arises from the possibility that trades may not be executed promptly, eliminating the profit margin. Counterparty risk is the danger that one party involved in the transaction may default on its obligation. Liquidity risk refers to the risk that an arbitrager cannot quickly sell or buy a position without significantly affecting the market price.

How has technology affected arbitrage strategies?

Technology has significantly impacted arbitrage strategies by increasing the speed and efficiency with which traders can identify and exploit pricing discrepancies. High-frequency trading (HFT) algorithms can detect and act on opportunities in milliseconds, far faster than human traders. This has made certain types of simple arbitrage much less common and has pushed human traders towards more complex strategies involving larger data sets and longer time horizons. Additionally, technology has increased the accessibility of global markets, thereby expanding the scope for cross-market arbitrage opportunities.