Such an operation would take decades, and centuries probably to exhaust and return to Earth the entire asteroid. In the process and in response the size of the Earth economy will grow due to the introduction of a vast new supply of industrial materials.

Introduction of extraterrestrial resources will cause these commodity prices to fall. But falling prices will cause industrial use (and world GDP) to rise. How much will prices fall, and how much will demand rise, and therefore how much maximum revenue can be extracted? This is not an easy calculation.