Currency Conversion for Cross-Country Price Comparison

Steps:

• Identify that book prices are quoted in local currencies of different countries.
• Recognize prices cannot be directly compared without a common unit.
• Determine exchange rates convert local prices to a single currency like USD.
• Conclude this enables meaningful numerical comparison.

Why B is correct:

• Exchange rates define the value of one currency in terms of another, allowing price conversion via the formula: Converted Price = Local Price × Exchange Rate.

Why the others are wrong:

• A: Direct tax rates affect final consumer costs but not the base price comparison across borders.
• C: Inflation rates adjust for purchasing power over time, not for static cross-country currency differences.
• D: Import tariffs impact import costs but are irrelevant for domestically sold books' listed prices.

Final answer: B