On an average-exchange-rate basis GDP per worker in the United States compared to India tends to be higher relative to the purchasing-power-parity basis (70 versus 13) because

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International arbitrage tends to equalize prices for tradable goods but is less effective for services due to their non-tradable nature. This discrepancy contributes to the difference in GDP per worker when comparing average exchange rates to purchasing power parity, as services make up a significant portion of the economy.

On an Average-Exchange-Rate Basis GDP Per Worker in the United