The grain trade from the Black Sea region to Athens, the Roman grain trade from Egypt to Rome on board ships specifically built for the trade, the wool trade between England and the Low Countries, the naval stores and mast trade from the Baltic region and the North American colonies to Great Britain and the rest of Europe, the sugar trade from the West Indies to Europe, the spice trade from the Dutch East Indies to Holland and then to Europe, the tobacco and cotton trade from the South to Great Britain, the Tea trade from China and India to Great Britain and Europe.
All of that was pure speculation?
Oh, and then there is the trade between the colonies and Great Britain in custom-built ships. It has been estimated that 1/3 of all British merchant ships at the time of the Revolution had been built for English shipowners in the colonies.
That was speculation too?
Depends on whether the goods were owned by the same people who owned the ships. If they were, it was speculation; if they weren't, it was freight, as the owner of the goods paid the owner of the ship to carry the goods as freight and bore any losses and kept all the gains.
I'm pretty sure the China tea trade was speculation. AFAIK the tea was bought in China by the East India Company and was auctioned off to wholesalers upon arrival in London.
Hans