Good questions. Re the first, from memory I believe I required that the economic activity be causually the result of Earth’s economy today, so that rules out alien economys from consideration.
Re the second, I think it’s complicated and the notion of gross product may break down at some point. I don’t have some very clear answer for you other than that I could think of no better metric to measure the size of the future economy’s output than GWP. (I’m not an economist.)
Robin Hanson’s post “The Limits of Growth” may be useful for understanding how to compare potential future economies of immense size to today’s economy. IIRC he makes comparisons using consumers today having some small probability of achieving something that could be had in the very large future economy. (He’s an economist. In short, I’d ask the economists for help with interpreting what GWP in far-future contexts over me.)
Good questions. Re the first, from memory I believe I required that the economic activity be causually the result of Earth’s economy today, so that rules out alien economys from consideration.
Re the second, I think it’s complicated and the notion of gross product may break down at some point. I don’t have some very clear answer for you other than that I could think of no better metric to measure the size of the future economy’s output than GWP. (I’m not an economist.)
Robin Hanson’s post “The Limits of Growth” may be useful for understanding how to compare potential future economies of immense size to today’s economy. IIRC he makes comparisons using consumers today having some small probability of achieving something that could be had in the very large future economy. (He’s an economist. In short, I’d ask the economists for help with interpreting what GWP in far-future contexts over me.)