Singapore is a small market, everyone would say. Yet it imports and exports so much goods and services it would be considered an important market for different businesses. Take bunkering for example; it is the largest single point of sales for the refueling of vessels in the world.
So how do markets grow? What drives them? It depends on who are the customers, and what grows their numbers or their demand in the goods and services of the market. How do supply help to drive demand? Be it through advertising, increasing distribution and availability, etc.
On the other hand, we got to think about how markets shrink as well. How did the market for video or movie rental shrink in face of the growth of streaming? When would an original big market be considered small for the incumbent to start looking elsewhere?