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That isn’t arbitrage. Arbitrage entails making a guaranteed profit, not relying on predictable fluctuations.

• ikeboy 8y ago
  Arbitrage over time is properly called arbitrage. If the fluctuations are known in advance, then you make a guaranteed profit by trading over time.
  • ummonk 8y ago
    Yes, but you don't "know" the fluctuations in advance. You just have educated guesses about how they will mean-revert.