The Thames has been very significant for the development of London as a financially and culturally important metropolis. The river provided water to people, encouraging the first settlements. It also provided a route for trade to be achieved. In terms of trade, the estuary at the mouth of the Thames was also important because it allowed ships to reach far inland, which contributed to commerce.
Exports are goods and services that are produced in one country and sold to buyers in another. Exports, along with imports, make up international trade.