Surplus of yet the demand. Most times the cause of this is either the customers who earlier demanded this items lost interest and withdrew or there was an exaggeration or miscalculation when the survey was carried out, these are scenarios where this surplus can exist.
The atmosphere of Venus is the layer of gases surrounding Venus. It is composed primarily of carbon dioxide and is much denser and hotter than that of Earth.
They pretty much had all they needed resource-wise in the country, trade was not a prerogative and even though Zheng He did go out exploring they were not interested in colonies or mercantilism.
Mercantilism was pretty much frowned upon within the Confucian system, merchants did not produce goods they moved them around and made money which made them a drain on the system. The few who were enterprising and maybe came up with some new product might often find themselves in competition from the government
The Emperor system considered itself the center of the world, the focus of the heavens. When outsiders came they gave tribute and fealty to the Emperor, so the outside world came to them, they did not need to go out
