Compare and contrast autarky and trade. How does trade help nations attain a higher production possibilities frontier? According to David Ricardo how does comparative advantage accomplish the aforementioned? Specify which groups gain and which lose.

Explanation:

Autarky is a policy against external trade;  a closed economy that does not allow external trade, in an attempt to reduce a country’s dependence on external trade.

Trade in itself could be internal or external. According to economist David Ricardo a country having comparative advantage implies that the economy has the ability to produce goods and services at a lower opportunity cost than that of trade partners.

The group that gains in the case of International trade may lose in the long-run if a country imposes high tariffs and stops international trade, it may produce a local benefit in the form of new jobs and industry. However, this country will lose relative to its neighbors: countries that were already better able to produce these items at a lower opportunity cost.

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c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current