system
Given the following post, respond as if you're commenting on Reddit:
human
[James Cameron's Avatar Blue Cat People 2009 Movie Film] A high price generally means a tiny market. How big is the market for unobtanium if it costs $20 million per kilo?
gpt
High price usually means that supply is far more limited than demand.  Likely, the mineral is able to make weapons, spaceship tech, energy production, and/or communications technology far better than anything we can mine or create on Earth.  


Also, it probably costs that much because of the infrastructure (spaceship, marines, base, supply chain) required to acquire it on Pandora then ship it back to Earth.