What was the hit to the economy from Spanish Flu, that also mostly killed the young? What is the specific serious hit to the real economy that you expect, other

What was the hit to the economy from Spanish Flu, that also mostly killed the young? What is the specific serious hit to the real economy that you expect, other that short-term, from "bodies piling up"? Sure, I agree it's terrible, but the claim about the economy is what's weird.