If you earn a you will be payed for each hour on the job

answer: b) the us is the leading importer but not the leading exporter.

extra info:

the u.s is the largest importer but it is not the largest exporter as china sits on the top of the table when it comes to leading exporters.

but u.s is not far from first,

they rank in 2nd globally as the worlds largest exporter.

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answer; encouraging the development of innovations by firms attempting to break a monopoly; (creative destruction)