When you strip the noise away, the real question is simple: merger arbitrage is less about direction and more about probability × time × spread. Three quick checks before you act: 1. Name the mechanism in plain English: Once a deal is announced, the target usually trades below the deal price. The spread compensates for deal-break risk and time-to-close. 2. Say why it matters for behavior or portfolio decisions: That framing turns what looks like a directional trade into a structured risk/reward calculation. 3. Set the review question: Ask whether the market is mispricing the mechanism or simply narrating it loudly. Market translation: A $50 target trading at $48 with a four-month close horizon and 5% deal break probability offers a different payoff profile than a directional long on the same stock. Failure mode: The mistake is treating a tight spread as "safe" without stress-testing the regulatory, antitrust and financing break scenarios. A lot of confusion disappears once you separate the headline from the mechanism.