The Further Adventures of Robinson Crusoe by Daniel Defoe Chapter 10 Page 18

Sumatra, and from thence to Siam, where we exchanged some of our wares for opium and some arrack; the first a commodity which bears a great price among the Chinese, and which at that time was much wanted there.

Then we went up to Saskan, were eight months out, and on our return to Bengal I was very well satisfied with my adventure. Our people in England often admire how officers, which the company send into India, and the merchants which generally stay there, get such very great estates as they do, and sometimes come home worth sixty or seventy thousand pounds at a time; but it is little matter for wonder, when we consider the innumerable ports and places where they have a free commerce; indeed, at the ports where the English ships come there is such great and constant demands for the growth of all other countries, that