Imagine an economy on Mars or the Moon. Some people move there, excited about the chance to live on the new frontier of human development. They set up shop and start providing services and goods to each other. They’ll need jobs like metallurgist, construction worker, physicist, farmer, material scientist, physician, etc. The technician with the 3D printer will trade with the computer repair girl who will trade with the doctor who will trade with the solar panel producer. Certainly very early colonies won’t do much trading and work more as a cohesive unit, with specific team members and job duties, running as a ship’s crew or military base more than a small town. But eventually once the outpost becomes big enough, trade will occur.

What will they use for money? Well, it’s not the point of this post, but I’d like to take a moment for speculation anyway. It’s possible that the centralized group that creates the space colony will see this problem ahead of time and establish their own currency. But it wouldn’t take much for someone to introduce a simple Bitcoin fork to create their own blockchain. Such a currency would only require an application running on a computer, something the colony would likely have lots of. I’ve written before that Bitcoin isn’t that great of a currency at present, but it does have benefits if your local currency is already pretty bad, see Venezuela. On Earth it functions as a floor beneath which local currencies can no longer do worse than. However, on Mars, the local currency would have a lot of uncertainty surrounding it. Maybe a bank has been set up, but why would people trust the bank? It doesn’t have a long history of trustworthy monetary policy like some Earth central banks do.

Suppose SpaceX sets up a Martian colony and creates a bank to hold everyone’s dollars. It’s too long to wait to ping back to Earth (average message/reply round trip is 6-40 minutes) to transfer Earth currency, so you’re left with trusting SpaceX’s bank that they won’t mismanage the currency, even though SpaceX doesn’t have any experience managing currency. Well, what if some enterprising people come over with a “MarsCoin” clone of Bitcoin, running a blockchain on Mars? You can send the code to Earth for audit, then run the code yourself on a local network of servers. If the block time is lower than it takes for a return ping to Earth (almost always true even if you’re using the 10 minute blocks of Bitcoin, which could be shortened), then you have a decentralized, trusted currency that’s much simpler than relying on distant Earth institutions or unproven Martian ones. Of course, then you need a special interplanetary blockchain to move currency between Earth and Mars with a very slow block speed, but we’re getting off on a tangent.

We have established that there will be a way to trade on Mars and between Mars and Earth. Mars will obviously have things it needs to buy from Earth, like difficult to manufacture parts, engineering and consulting services, and likely entertainment. But what will they be able to export to Earth? A country that can only import goods probably can’t sustain itself, unless there was positive immigration. We can thus treat reasons to immigrate to Mars as part of the answer to what Mars can export. I have compiled a list of possible ways the Martian economy can maintain a stable exchange rate with Earth.

Science

Science is the clear primary export of Mars today. As Robert Zubrin states in this excellent video, we believe Mars had liquid water on its surface for a long time, perhaps a billion years. On Earth, life showed up much sooner than a billion years after liquid water appeared. If we go to Mars and find evidence of life, that would help prove that the development of life is pretty common in the universe. On the other hand, if we don’t find much evidence of life, that could help point out that life isn’t very common on in the universe. Evidence of current or past life, could also help us determine whether all life is similar to that of life on Earth, using DNA to create amino acids and so on. These questions are “…real science. This is fundamental questions that thinking men and women have wondered about for thousands of years.”

From an economic standpoint, it’s clear that scientists on Earth are willing to pay billions of dollars for this data. They might send their own scientists to Mars, which would count as positive immigration, or they might hire Martians to conduct the science for them, but it’s clear that scientific interest in Mars is worth billions. It’s also worth mentioning that other celestial bodies would also have this benefit, the Moon likely less so than Mars, and Jupiter’s moons perhaps similarly valuable.

Tourism

Space tourism also seems like an important industry for a space colony, although perhaps not Mars. Andy Weir’s Artemis takes place on the Moon and space tourism is an important export industry. Tourists visit the Apollo 11 landing site and jump around at 1/6 Earth gravity. It seems likely that similar tourism might function on Mars, although there are serious limits. For example, the trip to Mars takes months, would occur in essentially zero-g, and usually is only done one way every two years. Large rooms with windows would seem both vital for any tourism industry and highly impractical without radiation shielding. Vacationing for a week on Mars wouldn’t be practical, unlike taking a week or two week vacation to the Moon. Perhaps a two year long sabbatical would appeal to some people, but probably not most. A more efficient transportation system, such as an ion drive ship between the planets might reduce the travel time or allow for interplanetary travel even when the planets are not close in their orbits. But until then, tourism is likely to be very limited.

Martian Souvenirs

If tourism is limited, perhaps actual Martian rocks will be more highly valued. Those might be much simpler to ship to a mass audience on Earth. Given the monopoly Martians would have on this industry, they could theoretically charge a hefty markup. This is, of course, in addition to the scientific relevance the rocks would have. On the less positive side, there may be regulatory issues for bringing alien rocks to Earth. Fears of alien bacteria that could kill everyone on Earth might cause prohibitions. Such a threat seems unlikely, but import bans are often irrational.

Reduced Launch Costs

Of all the rocky places in the solar system to launch a rocket, the surface of Venus with its Earth-like gravity, sulfuric acid rain, and insane heat, is probably the worst one. But Earth is a close second. Rocket launches must accelerate out of the “gravity well” of wherever their launch site is and then expend the energy needed to get to their target transfer orbit. Escaping the gravity well is very difficult on Earth’s surface. The Apollo program required very little fuel to get off the Moon’s surface because the gravity was so reduced (and the Moon has no atmosphere). Thus, the energy needed to get off of other rocky surfaces in the solar system is much less than Earth. Mars also orbits further out from the sun, which means you also need less energy to get to a transfer orbit to the asteroid belt or outer solar system. Thus, one economic benefit would be to offer Mars as a cheaper launching point for outer solar system exploration.

However, if you need to first bring an entire rocket and fuel to Mars before departing for your eventual target, you’re better off just leaving from Earth directly without dipping into the shallower, but still significant Martian gravity well. For this to be valuable, you’d need to be able to build the rocket on Mars, which seems much further off than the other ideas discussed here, or you’d have to create the fuel on Mars. This may be possible; SpaceX’ plan is to use the carbon dioxide in the Martian atmosphere and water ice on or near the surface to produce methane and oxygen as rocket fuel. One might also be able to find an asteroid or comet with water ice, carbon dioxide, or even methane, and bring it into orbit around Mars or the Moon, avoiding having to accelerate it into and out of Earth’s gravity well. Rocket manufacturing could then use a combination of terrestrial, martian, or lunar parts and fuel, supplemented by materials already in orbit, or even manufacturing plants in orbit. This could be sustainable in the long term. Asteroid mining would be extremely lucrative, with perhaps tens of billions of dollars in potential profit. If an asteroid mining company believed Mars, or the Moon could save them launch costs, they would likely purchase property, bring equipment and employees, and thus improve the Martian trade balance.

Natural Resources

Mars also has an abundance of natural resources in various compounds where they may be more common than on Earth. These include halogens, organic compounds, and deuterium. The extent and speed at which these will become useful to export from Mars are unclear, but they may eventually be useful as a source closer to the outer solar system than Earth, due to the reduced launch costs. Editing note: I decided to add this as separate category later after discussing this post.

On-Site Entertainment Production

This is another odd case, but it may be more immediately plausible than launching exploratory rockets from Mars. The low gravity of Mars or the Moon would allow for a different type of videography, with actors that actually weigh less able to jump large distances. This could be literal as for science fiction films that need to take place in low gravity, or perhaps more creative and unusual projects that endeavor to take advantage of this location in ways we have not yet conceived of. Again, however, the Moon may be a more accessible location than Mars, given the length and difficulty of travel.

Medicine

From what we know about the human body in lower gravity environments, the health effects are largely negative. There may be the possibility that osteoarthritis would be improved by living in a low-g environment, but anyone who has that problem would likely be old and might suffer from other problems. However, the severity of injuries from falls would likely be much less in low-g environments, and perhaps high blood pressure would be less of an issue. Nonetheless osteoporosis is known to get worse in zero-g, and so astronauts are forced to do weightlifting regimens in space to try and maintain their bone density. It’s possible that if the osteoporosis could be combated, people who suffer from osteoarthritis might live more comfortable retirements on Mars or the Moon. They could likely never return to Earth though, as their heart and muscles would have become significantly weaker and would likely give out upon return to Earth. We need more research on the human body under low-gravity conditions to see what the long term medical effects are.

Law and Society

This is much more likely to be a reason for positive immigration than for exports. People who currently live under legal systems on Earth may be interested in moving to a different legal system not currently available on Earth. They may even want to start their own society. That is not currently possible on Earth, as states claim almost all land on Earth. Moving to Mars due to its nonexistent or only slightly existent legal system would bring with it a variety or related goals and ideas, such as chance to shape the cultural future of Mars. One can see the related desires of immigrants who moved to the Americas from Europe in the 18th and 19th centuries (and earlier, I suppose). This would also include people who wanted to live on the edge of human exploration or contribute to the project of humanity reaching other celestial bodies, and perhaps eventually other stars.

There are of course limits here as well. Any existing Martian colony would have its own law and rules that might be just as restrictive as Earth, especially given the harsh conditions and lack of natural resources on Mars. To create a legal system and society on Mars, any group would require a massive amount of resources, equipment, and specialized knowledge, essentially creating a whole new colony. Could such a move possibly be cheaper than simply establishing a place on Earth? It’s hard to say. The problem on Earth is not just money and resources, but confronting states who have access to military power.

Capital Flows

It should be pointed out for completeness’ sake that of course Mars could potentially export nothing, but still expand their economy as Martians did productive work for each other. Then could borrow money from Earth, invest it, and Earthers would see a positive return. This would counter the negative pressure on the Martian exchange rate from exports. If Martian investments were failing though, then Martian currency would likely become pretty worthless to Earthers, and they’d likely stop selling goods to Mars. We should thus note a financial crisis could be quite problematic!

Conclusion

Mars has a variety of goods it can export, although the only immediately available ones are likely Science, Society, and perhaps space rock souvenirs. Others may eventually become economically useful, but will likely take some time.

Picture: Public Domain Image, Global mosaic of 102 Viking 1 Orbiter images of Mars taken on orbit 1,334, 22 February 1980. NASA