The largest economy on the earth is the economy of United States considering the value of GDP $15.685 trillion according to the data of 2012. The main reason behind the developed nature of economy is its factors of productions. The factors of productions in the America are more productive than that of other nations in the world.
The United States remained larger than other countries because it has developed a unique combination of population and prosperity. The United States is optimally utilizing its growing population for the purpose of development.
If the population is utilized efficiently, then a country would be able to maintain its per capita income stable. Considering the productivity and efficiency of workforce, the United States has remained larger than economies with much larger labor force.
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