Interesting take, there are many different ways to look at money and the economy. Unfortunately getting accurate predictions or even strict rules is difficult in any field that is difficult to conduct a controlled study on.
But I think to say most of its valuation comes from monetary policy is going to be difficult to defend. Apple’s valuation also reflects growth in earnings, cash flow, share repurchases, and expectations of future profitability.
A price-to-sales ratio of 10 in theory means investors are valuing the company at ten times one year’s revenue. But that may be reasonable if investors expect high profit margins, rapid future growth, or durable competitive advantages. Companies distribute profits but, revenue is not distributed to shareholders. And a stock’s value might come from future cash flows, not just distributions.