> I can 100% assure you that the world economy in 2100 will be smaller than today. I can't assure you that the moon or the planet Mercury will exist in 2100, b

> I can 100% assure you that the world economy in 2100 will be smaller than today. I can't assure you that the moon or the planet Mercury will exist in 2100, because 75 years is much too far ahead to forecast if we do or don't get e.g. von Neumann replicators by 2040 years and spend the next 60 using them to disassemble either or both into a Dyson swarm.