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So if the S&P and the money in bank accounts are also indicators of inflation, then where do we track wealth creation? Why do people generally view high stock prices as "good" but a higher CPI as "bad" if both are just indicators of inflation? Not trying to come across as critical. I'm just curious. You always hear that high stock prices and high levels of capital investment are signals of a good economy, while a high consumer price index is a signal of a bad economy
Inflation is not a monolithic thing. Prices are in flux, all the time. Think of it as information - price is just the current value, in one moment, at each transaction. "The Price" of something is just the market aggregation of that.
So it's pretty easy to say - what is the price of a stock? That gets you dollars per share. Now, what is the price of a gallon of milk? That's dollars per gallon. If a stock doubles relative to milk, was there inflation? What if the milk doubles relative to the stock? The answer is "maybe" to both. That's why they create indices, and multiples, to generalize price levels relative to some benchmark somewhere.
People view stock prices as good for a couple of reasons, I think. One, is because a lot of people are economically illiterate, and most people don't get inflation anyway -- its insidious. Two, a large amount of Americans have a good chunk of their wealth in equities, so that number going up makes them happy. Equities are liquid and prices are not sticky, so they reflect inflation well. The real reason to invest in equities, in my mind, is that they
do track inflation. If the stock market is going up much faster than real GDP, that is inflationary. Long term the net present value of a huge chunk of our economy can't outgrow real growth.
I think it makes sense to stop and remember what prices of stocks actually are, too. The concept of net present value is critical here. So if you take the actual cash generated by a company, the return on the capital you're giving, and make it a periodic cash flow in time it has a net present value depending on the interest rate, the cost of capital. Stocks can only change value for two reasons - one is that the market "thinks" that they have made some kind of change that increased or decreased the total cash flows that will be generated, and two is because the interest rate changed.
Think about the interest rate as a risk indicator. The higher the interest rate the higher perceived risk. So when the market makes big moves, what we're seeing is not company a or b suddenly generating more cash, but the overall risk, and therefore the time value of money, changing. If the market goes down, that means in aggregate the net present values of all the cash flows the market will ever give went down in price - i.e., interest rates went up. And vice versa.
Actually - I lied. There is a third reason prices can move, and that is because we price them in dollars, of course. So if you suddenly doubled the number of dollars in the world, their relative value would halve, and the stock prices (and the prices of everything else) would reflect that change.
Stock prices are prices just like anything else, they're just a little more ethereal because what is being priced is future profit instead of something tangible like socks or donuts or a pencil.
So why do stock prices going up mean a good economy? That tells us either companies are getting more profitable in aggregate, or perceived risk is low. In times of risk capital flies to lower risk, quality investments. Capital becoming cheaper means people, in aggregate, feel less risk.