Agree on the first three of your four bullet points. You're kinda missing the point on that last one: if you can correctly identify the value of the labor (agai

Agree on the first three of your four bullet points. You're kinda missing the point on that last one: if you can correctly identify the value of the labor (again, including capital goods) that go into making a product, then what you have is the minimum value that a product will sell for in the long term. And, importantly, in a free market the price of the good should tend to be around that value. I kind of alluded to it in my previous post but didn't quite spell it out completely I think. Effectively, it is the value at which you get zero profit from the sale. All else being equal, competitors will not be able to go any lower either (until and unless they gain some technical advantage) without selling at a loss. Exactly as you point out: there are various factors that can reduce that value - Marx points this out as well of course and I think it's sort of meant to be among the main contributions capitalism makes to historical economic development. But, for any interval of time over which there are no major technical advancements in the industry in question, in theory at least (i.e. in a more-or-less "pure" market with rigorous competition) the price of the product on the market will approach the point at which profit is minimized i.e. the value of the labor required to produce the good. Looked at another way: the real value of capital goods (in an economic sense, anyway) is not in the production they enable, but that they allow for more efficient use of future labor time. If, and only if, the savings a capital good provides in labor time to produce a product, is greater than the value in labor required to produce the capital good in the first place, is it "worthwhile" to produce the capital good and put it to use. You might hire someone with a sophisticated ditch-digging machine to dig your ditches for you, but would you still do it if you knew that producing that one ditch-digging machine took 500 men working 10-hour days for a month? And it was only good for digging 10 miles of ditches before breaking? Probably not, and the labor theory of value does a good job explaining why, IMO. All that said, of course that's not at all how our market functions especially nowadays, and there is a Marxist approach to analyzing that as well - but that's out of scope of this thread.