“Here is what one U.S. dollar buys in ten countries” sounds wonderfully concrete. It is also easy to get wrong. Exchange rates move, tourist districts are not national averages, a coffee is not the same product everywhere, and local wages matter as much as the sticker price.
A better way to read those comparisons is to understand purchasing power.
Why converting the menu price is only step one
If $1 converts into a large number of local currency units, that does not automatically mean the destination is cheap. What matters is the local price level: how many goods and services those units actually buy.
The World Bank’s International Comparison Program uses purchasing power parities, or PPPs, to compare price levels across economies. In simplified terms, PPP asks how much local currency is needed to buy an equivalent basket of goods and services.
A traveler should distinguish three different questions
Market exchange rate
How many local currency units you receive for a U.S. dollar today.
National purchasing power
How overall price levels compare after controlling for currency differences.
Tourist price
What you personally pay in an airport, resort, old town, beach club or neighborhood cafe. This can differ dramatically from the national average.
Five reasons the “$1 challenge” changes fast
Inflation
A 2019 street-food price may be meaningless in 2026 even if the currency barely moved.
Exchange-rate swings
The tourist’s effective buying power can change in months.
Location
Central Paris and a smaller French town are not one price level; neither are Bali beach clubs and local markets inland.
Product quality
Comparing “a meal” or “a taxi ride” without size, distance or quality is mostly storytelling.
Local income
Something that feels inexpensive to a visitor can still be costly relative to local wages.
Use a basket, not a stunt purchase
For a real trip, compare a normal day: midrange room, local transport, coffee, simple lunch, dinner, attraction ticket and one airport transfer. That tells you far more than asking whether a dollar buys one banana or three.
$1 is a fun travel lens — not a stable economic unit
The original idea still works as curiosity. Just treat every number as time-stamped, location-specific and incomplete without a broader view of local prices.