Bryan Caplan wrote a blog a few years ago, explaining the labour economics of artificial intelligence, using an exam question he poses to his graduate students:
Suppose artificial intelligence researchers produce and patent a perfect substitute for human labour at zero MC.
Use general equilibrium theory to predict the overall economic effects on human welfare before AND after the Artificial Intelligence software patent expires.
He then gave the answer about a week later:
While the patent lasts, the patent-holder will produce a monopoly quantity of AIs. As a result, the effective labour supply increases, and wages for human beings fall – but not to 0 because the patent-holder keeps P>MC.
The overall effect on human welfare, however, is still positive! Since the AIs produce more stuff, and only humans get to consume, GDP per human goes up. How is this possible if wages fall?
Simple: Earnings for NON-labour assets (land, capital, patents, etc.) must go up. Humans who only own labour are worse off, but anyone who owns a home, stocks, etc. experiences offsetting gains.
When the patent expires, this effect becomes even more extreme. With 0 fixed costs, wages fall to MC=0, but total output – and GDP per human – skyrockets.
Human owners of land, capital, and other non-labour assets capture 100% of all output. Humans who only have labour to sell, however, will starve without charity or tax-funded redistribution.
His logic is quite good. Caplan drew attention in the responses to his blog of Capt J Parker and Alex Godofsky in the comments section of his blog.
My comments at the time were as follows:
- An artificially intelligent robot that was a perfect substitute for human labour sounds like the replicators on star trek?
- Who operates the machines? who tells them what to do? what not to do?
- After the patent expired, would anyone care if the poor stole/copied the AI machines and made them for for themselves. who cares if a free good is stolen?
- Is it a crime to steal a replicator on star trek?
Utopia, you are standing in it! 
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