For what reason did colonial powers mandate export of raw materials in colonies? what labor structure did this establish

Colonial powers designed a very profitable trade model. While they were able to extract cheap raw materials from the territories they controlled, they exported those resources to the metropoli where there was enough technology to elaborate final consumption goods. Those goods had a much larger value than the sum of the value of its raw components, due to value-adding mechanisms, and were subsequently exported again to the colonies generating a large profit for the colonial power.

One of the main reasons why it was so cheap to obtain raw materials in the colonies was because the exploitation was based on slave labor.

the best description of postwar writers might be progressive.

following the war, writers showed a tendency to work on artistic or social matters rather than political themes. while postwar literature may not have been the greatest period of english literature, the themes provided excellent critics a high number of novels. such examples include anthony burgess, anthony powell and frank kermode, all of which can be placed under the progressive view.