Question

This point is one of the economic causes of the revolt of 1857 in my text book

- British strategy of buying cheap raw materials from India and selling British manufactured goods at low rates damaged the Indian economy.

I am unsure what this means

Answer 1

It means (according to what you have typed) that British used this method where they bought cheap materials. In lot of cases cheap materials is of low quality. They manufactured the goods at very low prices. Economy is damaged when there is no high profit. Selling at low price means that the profit is low or nil. This will lead to damage in economy.