I've just seen Black Panther and I was thinking about Wakanda.
In the movie we see Wakanda as one of the most technologically advanced nations in the world. Its capital resembles a kind of African Dubai with a futuristic appearance, and probably the same wealth.
So I'm wondering: how did they get so rich? Where does that technology come from?
In the movie king T'Challa states that they don't sell weapons to other nations; they own tons of Vibranium which they secretly keep hidden (agent Everett Ross thought they had only few quintals of it) so they don't even export that, nobody in the world knows about the real Wakanda.
Is there any explanation?