Prices of things are set by the law of supply and demand, not by the amount of labor that goes into making them, or by the subjective opinion of the purchaser.
Correct, the amount of labor does not have anything to do with prices of final goods. Also correct that supply and demand set prices. But subjective value is part of demand. Demand is the combination of valuing something and having the means to exchange for it. It is important to think of demand subjectively, and not objectively. People value things differently, so it is not possible to aggregate the "amount of demand" in an entire economy. You simply cannot add wanting apples and wanting computers together.
The first statement is correct. Labor, for purposes of this discussion, can be added to a broader term, "cost of production." So labor, resources needed to produce, etc. make up costs of production. As I think you agree, costs of production do not determine prices. Supply and demand do. If costs of production are higher than the market price, less goods will be produced, the supply will be decreased, and the market price of the final good will rise. If costs of production are far lower than the market price (meaning a greater opportunity to profit) producers will expand their supply of goods, and prices eventually will fall. The cost of production is really just another price, or more correctly collection of different individual prices (materials, labor of each worker, etc). The price of a final good is determined by the subjective valuations of consumers and the supply of the good. The same is true of the price of the various costs of production. In this way, goods that are more highly demanded (and thus in relative terms more scarce) will be more expensive, ensuring they are used the most carefully.
Subjective value, really, is just an extended explanation of demand.
The next part I decided to respond to line by line. I read the entire thing, so I am not responding out of context, it is just easier to respond to the below in this way.
Agreed.
Correct. Of course machines produce goods as well, but ultimately human labor is behind the machines. I want you to remember your use of
mental human labor.
This is not true. If one saves their hard earned money, and retires, they are not subsisting on the efforts of others. If they are not working because they have money saved up and no longer need to work as much because of those savings, then they simply put off consumption in the present at the time of earning the money to enjoy less work and more consumption in the future. It absolutely does not necessarily follow that people who do not work are subsisting on the efforts of others if they are supporting themselves with
past work. The rich would fall into this category. Much of their wealth was simply saved and accumulated, potentially over generations. It is money that was worked for but that has yet to be spent. They are not subsisting on the efforts of others, they are subsisting on their
own past efforts.
Many owners of capital also have much more
mental labor, rather than physical, which is why you may think they are not working. That is not to say they are smarter than the workers they employ. It takes a lot of organizational skill to estimate how much people value something, how much you can produce, who can do the job of producing it, what materials you will need, how much it will cost...they are not sitting around doing nothing. They are being paid to plan their businesses. If they plan correctly, they make a profit. If they plan badly, they suffer losses.
As I explained above, profit is clearly earned. The way the tax code defines it is irrelevant. The tax code in the US is a mess. Those who make profit are not profiting off labor, but their own organizational and entrepreneurial labor. Again, this is where Marx went wrong. He thought prices were determined by labor, and profit was an exploitation of labor. But prices are determined by supply and demand. Demand is determined by subjective value. It is the job of the producer to determine what people are valuing and how best to provide it. That is a vital service, and if they succeed they are paid for it. There payment is called profit.
What's important is that when too much of the income goes to the owners, rather than than the workers, workers can afford to buy less and less stuff. When they can't afford to buy stuff, effective demand for the stuff they're making goes down. When there's not demand, workers get laid off, which decreases demand even more. It's not a cycle that automatically ends by itself. It's an enormous, unnecessary waste that could be fixed, given the right policies.
Again with the "too much." The price of a final good and the price of labor are not related in the ways you seem to be assuming. The bigger problem in this last statement, however, is the assumption that the business cycle is caused by falls in aggregate demand, leading to more layoffs, and thus more falls in demand, until the economy is in recession. This theory was advocated by Keynes, and it is not correct.
Ultimately, aggregate demand is aggregate supply. This is Say's law (which Keynes is said to have refuted, but he refuted a mischaracterization of Say's law. In other words, he refuted his own strawman).
Thus, there can never be any shortage of aggregate demand, since aggregate demand is nothing but aggregate supply as expressed by the supply of money.
This article goes into depth, and I will quote from it.
It Is Not the Aggregate Demand, Stupid! - Jeremie T.A. Rostan - Mises Daily
"Imagine an economy that produces 100 goods per year, and has a fixed stock of money of 150 coins. Each year, individuals spend 80 coins on consumption, and invest 20. The remaining 50 coins are held in cash balances and, in the aggregate, are never in circulation. Simplistically, let's assume that, in this situation, each good is worth 1 coin and there is no unemployment.
One day, for some reason, individuals increase their cash balances, meaning that they "hoard" more coins than before. Suddenly, they spend and save, respectively, 72 and 18 only. 10 coins are thus added to cash balances. While aggregate supply is unaffected (100 goods,) aggregate demand (the supply of money) falls to 90 coins. Clearly, this only means that, ceteris paribus, each good is now worth 0.9 coins only — i.e., that 1 coin is now worth more than 1 good. Less money is spent in the economy, but the monetary unit is worth more. Production (aggregate supply) is unaffected, and cash balances have increased.
True enough, this Humean metaphor is deceiving: money is, as Hayek coined, a "loose joint," meaning that the structure of prices takes time to adapt itself to changes in the supply of money. But this, in turn, means that there can never, never, never be any shortage of aggregate demand (level of spending, supply of money) in the economy and that the best thing a government can do when consumption and/or investment are decreasing is to laisser faire.
Pumping money into the economy for fear of a shortage of aggregate demand would only distort a structure of prices that is already adapting to new spending patterns."