My understanding of the original idea for derivatives was apportioning risks into pieces that could be independently valued by different experts/markets. For e

My understanding of the original idea for derivatives was apportioning risks into pieces that could be independently valued by different experts/markets. For example, say a company wanted to finance an X factory in Y country. The original lender would have to be an expert at evaluating risk in the X market and the Y currency market, which is a small pool of investors. If derivatives could split the risk into X market risk and Y currency risk and sell them separately to specialists in each risk, then the factory was much more likely to find funding, at lower rates, etc. The "world" ended up with a factory that would not have been built, with all the associated wealth, which is positive sum. Am I missing something that makes derivatives negative sum in this case?