When it comes to measuring the value of things on Mars, it’s hard to find a baseline. You can balance things against import mass (like the slugs of Andy Weir’s Artemis), or the raw dollar cost considering launch and purchase cost. Both start to fall apart as our settlement industrialises and the value of goods is tied more and more to Mars rather than Earth. Enter a new value basis – one with a fixed root in engineering that can scale to any settlement beyond Earth. Enter the hydrogen economy.