Has the largest metropolitan economy in the world.
a. tokyo
b. seoul
c. taipei
d. hong kong

Economies can be compared with comparison of their GDP. GDP stands for Gross domestic product (GDP) is a monetary measure of the market value of all final goods and services produced in a period (quarterly or yearly). It is the size of the economy and primary indicator for the health of a country's economy. According to the last statistics China (hong Kong, solution:D, has the largest metropolitan economy in the world.

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