The greatest expense would be time. Trying to rediscover a science, from the beginning, in one or a handful of generations would require crushing amounts of money and work. If any science is ever so thoroughly lost, it would be hopeless to expect it to be retrieved so rapidly—it could only be a long-term project.
I don’t think it would be too bad, though. Look at how rapidly science has developed since the end of the Dark Ages.
The greatest expense would be time. Trying to rediscover a science, from the beginning, in one or a handful of generations would require crushing amounts of money and work. If any science is ever so thoroughly lost, it would be hopeless to expect it to be retrieved so rapidly—it could only be a long-term project.
I don’t think it would be too bad, though. Look at how rapidly science has developed since the end of the Dark Ages.