The authors main point is that

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1. The government ought to subsidize C and D
2. Wages ought to be independent of international trade
3. It is impossible to attain national self sufficiency
4. The varying productivity of the various industries leads tot he inequalities in wages of workers in these industries
5. A policy that draws labour from the fields of catater natural productiveness to fields of lower natural productiveness tends to redirect purchasing power.

Answer: E
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