S. has 28% of global gross domestic output. A better measure, many economists figure, is to compare the cost of commodities and services in different nations. By that measure, the U.

但若按许多经济学家认为的另一种更好的标准来衡量，也就是用不同国家的商品及服务成本来衡量的话，美国GDP所占比重仅有23%。

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Scotland's economic output - measured by gross domestic product - is predicted to increase in the range of 1% to 1.5% next year, which will narrow the gap with the UK average.

BBC: Scots house prices to match UK rises

U.S. gross domestic product the broadest measure of economic output shrank in the fourth quarter of last year.

WSJ: Economy Adds 157,000 Jobs

This is one of the reasons why U.S. service industries only export about three percent of their gross output.

FORBES: New Free Trade Talks On Services Key To U.S. Job Growth