how many zeroes are in a trillion dollars? it is a large number. trillion dollar ideas for a single planet civilisation mean a lot of value. for a multiplanetary one, it is just a small number. i am guessing in a few centuries, there would be more money than a trillion dollars dedicated to maintenance of the important cultural artifacts.
what trillion dollar ideas do exist today? cryptocurreny, spacetech, evs and artificial intelligence.
anything which creates more value than a trillion dollars comes into this category. i am thinking of the next trillion dollar idea. robotics seems one to me.