If there is risk-free arbitrage, spot arbitrage is the closest to risk-free arbitrage on the premise of ensuring your delivery ability. The remaining risk is only the risk of achieving this result. For example, the margin of future positions increases the risk, and the liquidity risk when closing positions.
In other arbitrage methods, the risk increases in turn, while the current arbitrage
So the so-called risk-free arbitrage is still risky, just the degree of relative risk.
In fact, the essence is speculation on the price difference. Moreover, futures arbitrage looks simple, but it actually needs some professionalism. Because we need to understand the essential reason of price difference. If the price difference does not come back one day, the result will be years of hard work and losses.
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