I frankly admit that I am sympathetic to Marxist thinkers. Even when I don't agree with them they often provide interesting insights.
Yet the diffuse notion of capital is indeed the key problem of Marxism as an economic theory whereas mainstream economics has a fairly clear one: you are more productive with a computer than with a typewriter, more productive with a lawnmower than with a scythe.
And if you're really productive you turn you lawnmower into capital, start a business, perhaps get a loan using your mower and house as capital so you can buy more mowers, and hire a crew as you expand. A person here in town even made millions by hooking power spray painters to his tractor to paint farm fences, both sides at once, just by driving down the fence row.
Yet we do not want capital to gain a lot of political power relative to labour because wealth is unequally distributed. If it were hypothetically absolutely evenly distributed the balance of powers between labour and capital would be irrelevant.
How can capital gain power when it's a
thing, like a deed or a car tiitle, that can be used by the owner in powerful ways in the market place? Recently we've been successfully reining in the power of capital by collapsing the housing market so family wealth has dropped by around 30%, and tightening loans so capital can't be used to start small businesses, but does anyone outside the administration think that's a good thing?
Yet it isn't, the political power of capital sits in the hand of very few, the 1% (if you take a look at actual data it might very well be rather the 0,1%).
So this is my social democratic (Being a good classical liberal I care about empirics. Social democracy, visible in Scandinavia or the post WWII consensus from 1945 until roughly 1980 in all the West lead to good GDP growth, low income inequality, decent education and so on. It is simply empirically the best system.) position.
We called that period "Euroschlerosis", slow income growth, perpetually high unemployment, and reliance on a constant influx of Muslim immigrants to work without the heavy overhead of labor regulations.
Sweden, for example, thrived under free-market policies in the 1800's and the first half of the 1900's. In the 1950's their tax rates started going up, and in the 1960's and 1970's their government ballooned, dropping them from 4th in per capita GDP to 14th by the early 90's, and severly limiting the ability of Swedes to use their personal capital to start a business. Of the top 100 Swedish firms today, only 2 were started after 1970, whereas American business is full of recent garage startups like Microsoft, Apple, and Cisco, along with countless restaurant chains, management firms, and all sorts of other enterprises. In Sweden, to be a big company today you had to get in before the lock. Sweden also had high levels of income and income equality, and low unemployment,
before the expansion of their social welfare state. The Swedes who fled to America have 50% higher incomes than Swedes who stayed in Sweden. So since the 90's the Swedes have been rolling back the state.
In Norway's case, their government is primarily funded by selling oil and gas to the rest of Europe. If you want to know what a government could do with all the social spending without any of the taxes or deficits, there's your example.
I disagree with communists as they ignore that capital is simply economically productive and I disagree with capitalists as they ignore that the political power of capital is undemocratic and has already partly transformed our Western democracies into oligarchies. The form might still be democratic but the content isn't.
But workers
own capital (unless you're going with the conspiracy theory that capital isn't a thing people own, but a class of alien overlords, while labor is the humans brought here by Xenu).
Last but not least social democracy is moderate and inherently conservative (Roosevelt saved capitalism from the capitalists, prevented with the New Deal that another system like fascism in Europe could become a viable option.) whereas fascism, communism or anarcho-capitalism are anything but.
Roosevelt sold workers out
to the capitalists, cutting deals with big business to free them from things like union contracts, and then put in a string of wage freezes. Along with Hoover, his response to an stockmarket crash (a collapse in the value of capital) was to soak the rich. The recovery from the crash was well underway by 1931, and we'd regained most of the losses. But Hoover reacted to the drop in government revenues by trying to grab the same size piece from a smaller pie by dramatically raising the tax rates. That was a disaster, and Roosevelt doubled-down on it, extending and dramatically deepening the depression. Whenever the economy would start twitching back to life, he'd stomp on it again.
Top down, centralized control doesn't work, and can't work, because no human brain can understand all the transactions of the market, nor the reason for them. For example, in my region of the country Roosevelt threw all the coal miners out of work by dictating a fixed price for coal, I suppose on the theory that coal is coal and an economy needs coal. But all coal is not remotely the same. There is metallurgical grade anthracite (very pricey) to bituminous to lignite. Each of those types also has grades based on sulfur content, ash content, heating content, and moisture content. Since my region mined the good stuff, which costs a lot to dig out, the mines closed down. That hurt steel production, since you can't make steel with lignite.
I suppose you could argue that he hurt those evil capitalist mine owners, but the people standing in the soup lines were the miners. At the time the
left was screaming about Roosevelt being a big-business old-money capitalist who sold out the American worker, while the right denounced him as a big-government megalomaniac who was destroying American business. Both things were true. Fortunately the Supreme Court rolled back most of his attempts at regulating the economy, and we managed to recover, rebounding strongly in 1940 despite a drop in foreign trade. By 1941 we were booming again, with housing starts and car sales leading the way. Due to Roosevelts mucking around, we were one of the last countries to recover from the depression.