Such a trading system sounds a bit primitive, but the technological developments had certainly not stood still. For example, a technique had been developed that allowed people to control gravity themselves. And this led to special occurences.
Because people knew how to influence gravity with so-called anti-gravity technology, people were able to live in floating cities. Houses and buildings could be built above the ground. These cities were sometimes up to 2 miles (3.2 kilometers) from the Earth’s surface.
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