well if you think that everyone in china is suddenly immune due to the first wave and the crisis is over?, then the model your following is not a realistic model
yes what i say is not good news for the economy.. but this aint about the ecomony this is about human life
the economy is screwed whether now or in 2 years. so the only real thing to be concentrating on is the health impact and the methods of reducing risk/amount of death counts spiralling
yes models are not perfect utopia.. but then when is reality utopia
No, what you've described is not a model, it's more or less a one dimensional look at the problem.
It's simply not accurate. To get it better, take some random samples of the % population that has antibodies to the Covid-19. Don't go with the presumption that you know or can guess that number from prior statistics.
https://www.latimes.com/california/story/2020-04-11/bay-area-coronavirus-deaths-signs-of-earlier-spread-californiaAs for the economy, the way that gets screwed is not by facts but by peoples' attitudes. If the people think everything is hopeless you have huge problems with the economy.