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In most cases it is impossible to observe the host galaxies of quasars because
Foreign Trade
The exchange of goods, services, and capital between countries or territories, involving imports and exports.
Comparative Advantage
The capacity for a person, business, or nation to generate a product or service with a smaller opportunity cost compared to its rivals.
Competition
Rivalry among business firms for resources and customers.
Absolute Advantage
The ability of a country, individual, company, or region to produce a good or service more efficiently than its competitors when using the same amount of resources.
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