[frickinLasers]

As someone who is essentially financially illiterate, what does this mean, "allocate resources efficiently?" Nobody's investing in companies that promise to cure world hunger or alleviate childhood suffering. They're investing in technologies that can extract the most wealth from the population, regardless of externalities. Is that desirable?

Then again, I can't fathom what people would be doing with their money if the stock market weren't there. I imagine they might naturally wind up with some sort of...stock market.

[Alsedarna]

The operating principle here being that prices are units of information, which in aggregate reveal some combination of market demand, present supply, production costs, etc. All else being equal, an investor who's looking to put an investment into a new business will try to find the best rate of return. The existence of a relatively higher profit margin for an industry suggests an unmet market need, and then directs the flow of capital into it (if you expect that for every $1 you invest into a roofing nail plant will return $1.25 over the next year vs a $2 return from a new insulin plant, more new cash will flow into the insulin plant, more insulin gets made, and if the investor guessed right about the demand for it, they turn a profit). In a sentence, money flows towards trying to give people what we think they want more of.

The theory posited above is that you could try to manipulate these signals as a sort of economic warfare. If you expect that every dollar you put into our aforementioned roofing nail factory will get you minuscule or negative return, nobody's going to want to invest in building/expanding nail factories, and they'll put their cash somewhere it can grow instead. This is all well and good so long as you've got happy trading relationships with people who can sell you nails, but if one day the nails stop coming--you've got a supply chain shock until you either open new factories or find someone else willing to sell nails to you. The theory here being that if you had a LOT of goods that became tied up in a single point of failure--someone forcing that failure could create a great deal of internal instability to be exploited for geopolitical ends.

[jfim]

That's what's meant by efficiency, it's allocating it to the place that has the highest return on investment.

As you point out, in practice what's efficient is what can capture the highest return, not necessarily the highest return per se. If say investing in education had high returns society wide but those returns couldn't be captured, that's not an efficient use of private capital.

[saubeidl]

As somebody doesn't consider himself a capitalist, wouldn't it be fair to say it is "the most efficient" in precisely one thing: capital reproducing itself?

And if so, why is that necessarily a good thing? Why should that be our goal as society as opposed to things like minimizing child mortality, increasing literacy rates, making sure we don't have a ton of our fellow humans living on the street in misery etc etc - things that make the lives of our fellow humans better? Why is capital growth the metric we have chosen to optimize for? Surely there's better things to optimize for?

Excuse the polemic, but infinite growth with no regard for anything else is the ideology of a cancer cell - and to me that is increasingly what it feels like when we are wasting all these resources on a dying planet just to make numbers go up.