Arbitrage

Arbitrage is the simultaneous purchase and sale of the same asset in different markets to profit from a price difference. If gold trades at 2,650 dollars per ounce in London and 2,655 in New York, an arbitrageur buys in one and sells in the other, capturing the spread with little directional risk.

Why it matters

Arbitrage is the invisible force that keeps prices consistent across the world. Every time a gap opens between exchanges, futures and spot, or an ETF and its underlying holdings, arbitrageurs close it and are paid for doing so. This is why a globally traded asset has one price rather than hundreds, and why ETF shares track their net asset value.

Persistent gaps signal barriers rather than free money. The kimchi premium, where bitcoin traded several percent higher in South Korea than elsewhere during 2017 and again in later cycles, persisted because capital controls made the arbitrage hard to complete.

In the gold vs bitcoin debate

Arbitrage friction reveals how each asset moves. Closing a gold price gap between continents can require chartering secure air freight, refining bars to a new standard, and days of settlement, which is why regional gold premiums can persist. Closing a bitcoin gap requires a transaction that confirms in about an hour at most, or seconds on exchange ledgers. Bitcoin's arbitrage is limited mainly by fiat banking rails, gold's by physics.