Most people read the Big Mac Index top to bottom and conclude: "Switzerland is expensive, Korea is cheap." Half right, half dangerous. The index measures exactly one thing — whether a currency looks cheap or pricey against the dollar. But readers keep taking one step too far: "the burger is cheap, so living there must be cheap." That extra step is the target of this piece. The definition lives in our other articles; not a single line of it is repeated here. We look only at what the index pushes off-screen.

A burger price is not a world price

The index leans on the premise that the same good should cost roughly the same everywhere. But a Big Mac isn't really a finished burger — it's a bundle of that country's services. Patty and bun cross borders; the wage of the person grilling them, the store rent, the VAT, the electricity, the cleaning bill do not. Economists call those non-tradables. More than half of a Big Mac's price is, in fact, "labor and space consumed only in that neighborhood."

The game data shows it cleanly. A Swiss Big Mac is CHF 6.70, or $7.73. The same dataset notes that Swiss McDonald's workers earn about $25/hr — among the highest on earth. Bread and beef aren't three times pricier in Switzerland; the expensive part is the hour of work that grills them. When the index shouts "strong franc," much of what it actually measured is Switzerland's high wages and rents — the price of local services, not currency value.

Take apart Korea's deceptively cheap burger

Korea's Big Mac is ₩6,520, or $4.78 — about 16% below the U.S. $5.69, so the table alone says "Korea is cheap." As the editor, I'll add this: that one word "cheap" runs exactly opposite to how living in Korea actually feels, and it nags at me. A burger 16% cheaper than the U.S. does not mean Korean living costs are 16% lower. The Big Mac contains none of Korea's jeonse/monthly rent, healthcare, education, or telecom bills. What it does contain is Korean dining-sector labor and rent — plus a ferocious restaurant competition that keeps burger prices pinned down.

That competition is the point. In Korea, fast food, snack shops, and convenience-store lunchboxes battle each other in 1,000-won increments, and that structure crushes the burger price. The Big Mac is cheap not because the won is cheap, but partly because Korea's dining market won't let prices rise. The same logic hits the Philippines (where Jollibee outguns McDonald's) and Colombia (where local chains win). The index misfiles this "local competitive intensity" as currency weakness.

The table secretly mixes in different burgers

Look at the India row: INR 199, $2.39. Except that's not a Big Mac. Indian McDonald's uses no beef, so it lists the chicken Maharaja Mac. Different inputs, different recipe, same cell in the table — and we call it "India's currency is cheap." Muslim-majority stores go halal; kosher stores in Israel skip the cheeseburger. The "same good" premise breaks in patches. When the baseline of comparison wobbles, the over/undervaluation numbers built on it wobble too.

So how far can you trust it?

This isn't a call to throw the index out. It just has rooms it belongs in and rooms it doesn't. What the index does well is fling a directional signal at you — "the yen looks unusually cheap against the dollar." Japan's $3.21 roughly mirrors the weak-yen episode. What it cannot do is answer the cost-of-living question, "so what does a month there actually cost?" That belongs to broad-basket gauges like OECD PPP or a statistics-agency cost-of-living/dining index, which include rent, healthcare, and schooling. A single burger is one cell of that basket.

• Read it as: "On the burger, this currency looks cheap/pricey versus the dollar." (direction)
• Don't read it as: "The burger is cheap, so everything there is cheap / living there costs less." (a leap that skips rent and healthcare)
• One step further: if you care about a currency's absolute level, pair it with the income-adjusted version or official PPP.

This is not investment advice — it's an exercise in not misreading a gauge. An undervalued reading does not mean the currency will rise soon; exchange rates move on stronger forces like interest rates, policy, and trade.

One last editorial judgment: the index's real worth isn't accuracy, it's that it changes the question. The moment you ask "why does the same burger run $7.73 in Switzerland and $3.21 in Japan?" you're already standing in front of the real variables — rent, wages, taxes, competition. A table row is not the answer but the question; knowing that is what lets you use the Big Mac Index safely.

Guess Big Mac prices yourself and you'll quickly feel which rows carry the biggest "hidden drivers." 🍔 Compare them in the Big Mac Index game.