The question is not so much availability of materials as it is the availability of materials out of Earth's gravity well. If you are able to extract materials a

The question is not so much availability of materials as it is the availability of materials out of Earth's gravity well. If you are able to extract materials and build stuff on the moon, launching them into space is then subject to a much nicer "rocket equation". It's not a question of price, either. Building and launching from the moon enables new possibilities.