they had a surplus in grain
Grain and oil
they needed wood and eventually they had to trade their surplus for it and other things they didn't have but needed badly.
The Sumerians advanced their civilizations in several ways. They invented writing and mathematics which advanced things greatly. They also invented the wheel, which advanced trade and travel.
what did the sumerians first used for trade
The plow and the wheel helped sumerians move things.
Yes, yes they do (:
they needed wood and eventually they had to trade their surplus for it and other things they didn't have but needed badly.
their trade surplus
Germany currently has a trade surplus. COOL HUH !
They traded items that the have a surplus of for items that they cannot get.
Because they were a free country and they had a surplus of things.
It has a surplus in trade of invisibles, and a deficit in trade of visibles.
A trade surplus because of their auto exports.
surplus Quantify the surplus amount as in March 2011
"China has a lage trade surplus."
The Sumerians developed a large trade network in part because some of the resources their civilization required were not found in Mesopotamia. Wood is especially scarce in this region so lumber became one of the key trade items for the Sumerians. But most items the Sumerians traded for were those not available in Mesopotamia.
The people living in Mesopotamia did not starve and due to the surplus, they could trade others for the things they needed that they didn't have.
One example of trade surplus is South Korea.