Nvidia and Micron Make Up 34% of America's Earnings Boom

So someone correct me but I think this is sort of an accounting trick. When Microsoft buys an Nvidia GPU for $100, it will claim that it lasts 5 years, so writes down $20 in the expense column for this year. Meanwhile Nvidia takes all the profit at time of sale, $100. So for each GPU bought, SP500 logs $80 of profit, even though no money entered or left the SP500.

(Yes of course the GPU cost something to make, but the margins on these things are very high. The point is that revenue is immediate while capital expenses are amortized. And capital expenditure has gone way up lately.)

In theory if people are giving all of the money to Nvidia, then it's because they find it valuable (in this case companies purchasing GPUs) so even if the GPUs weren't so expensive in theory there would still be economic value derived from the transactions.

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Aka, inflation.