Why This Question Comes Up

"Walk me through a MAC clause" or "would this event let the buyer walk away?" is a recurring M&A interview question because it tests two things at once: whether you understand a specific piece of deal documentation, and whether you can apply a legal standard to a fact pattern under time pressure. Most candidates can define a Material Adverse Change (MAC) clause in the abstract. Far fewer can actually apply the test to a concrete scenario, or explain why real-world MAC disputes almost never end with a judge's ruling. This is the same distinction covered in MAC Clause and Deal Closing Risk and, at a more advanced level using a real transaction, in MAC in Volatile Markets.

A Four-Step Framework for Answering

Step 1 — Define the clause precisely. Say what a MAC clause actually is: a contractual condition that lets the buyer refuse to close (or renegotiate) if the target's business deteriorates severely enough between signing and closing. Naming the two variants — MAC and MAE — and noting they're usually used interchangeably shows you know the terminology without overcomplicating the answer.

Step 2 — Apply the three-part legal test. Delaware's standard (the jurisdiction most large public deals are governed by) requires a decline to be (a) substantial relative to the target's overall long-term earnings power, (b) durationally significant rather than a short-term dip, and (c) not excluded by standard carve-outs — industry-wide downturns, general macroeconomic conditions, changes in law, or effects of the merger announcement itself. Walk through each prong explicitly against the numbers you're given rather than jumping straight to a conclusion.

Step 3 — Check for a separate ordinary-course covenant claim. Many candidates stop at the MAC test and miss that most agreements separately require the target to keep operating consistent with historical practice (dividends, capex, hiring) between signing and closing — independent of whether an MAE occurred. If the fact pattern includes a change in the target's behavior, flag this as a second, often more provable, legal theory.

Step 4 — Explain how these disputes actually resolve. This is the step that separates a strong answer from an average one. Almost no MAC dispute reaches a final court ruling. Buyers use the threat of litigation as leverage to renegotiate price; sellers settle because a trial is costly, slow, and uncertain even when they're legally favored. Naming this dynamic — rather than assuming the "correct" answer is always "yes, the buyer can walk" or "no, the buyer can't" — signals that you understand how these clauses function commercially, not just legally.

Applying the Framework to a Real Deal

The 2020 Tiffany-LVMH dispute is a useful worked example because every step of the framework maps onto real, documented facts. LVMH agreed to acquire Tiffany & Co. for $135.00 per share in November 2019. When COVID-19 hit, Tiffany's quarterly sales fell 29% year-over-year and LVMH argued this triggered its MAC clause. Applying Step 2: the decline was severe, but by the time Tiffany sued in September 2020, sales were already recovering — weakening the "durationally significant" prong — and a global pandemic hitting an entire sector is close to the definition of an excluded, industry-wide macroeconomic event. Applying Step 3: LVMH also argued Tiffany breached its ordinary-course covenant by continuing to pay dividends during the pandemic — a separate, more factually provable claim. Applying Step 4: the case never reached a ruling. The two sides settled in October 2020 with Tiffany accepting a reduced price of $131.50 per share, a $425 million concession, in exchange for LVMH dropping its objections.

We walk through the full numeric price-concession calculation and a side-by-side test of both the MAE and ordinary-course claims in MAC in Volatile Markets — good practice for structuring your own answer to this style of question before it comes up in a real interview.

Common Ways Candidates Lose Points

Interviewers frequently see candidates assume that any large negative number automatically satisfies a MAC test, without checking it against all three prongs — or the carve-outs. Others confuse a MAC claim with an ordinary-course covenant breach, treating them as the same legal theory when they're contractually distinct. The strongest answers explicitly separate the two theories, apply the test methodically, and end by explaining why the realistic outcome of most such disputes is a negotiated settlement rather than a courtroom verdict.