That's computing based on purely the discounted value of money. The more useful metric is not the % of inflation, but rather the % you can get on your money lyi

That's computing based on purely the discounted value of money. The more useful metric is not the % of inflation, but rather the % you can get on your money lying around (your answer assumes that to be 40% annually as well - i.e. a real rate of zero, but real rates on all of your options could be deeply negative as well). (though from an academic point of view you are completely correct)