I think I'm what could be called a "Market Socialist". I strongly believe that free, competitive markets drive innovation and successful response to changing circumstances. I also believe regulation is strongly necessary for markets to be truly competitive and not subject to a variety of "market failures". This include monopoly and various forms of near monopoly, "race to the bottom" enshitification, and several more. This regulation has a cost and unfortunately, some of the solutions require replacement of an entire market area by government-operated business, which of course costs some money.
There are a few areas that history has shown the free market cannot work: The first is the military. Some humans are prone to aggressive acts, and occasionally are charismatic enough to get others to support them. We need military and police forces to keep these in check, and history has shown, over and over, that if these things are operated by private enterprise, societal collapse is inevitable. The cops and soldiers must be strongly controlled by highly democratic institutions that are only motivated by the public good: something, whether it's strong ethics rules, public transparency, or something else, keeps them from using the power that these agencies give them for selfish or destructive goals.
The list of these necessarily public services is long: the court system, the roads, the postal service, communications networks, health care, many more. We can argue about exactly how to nationalize these systems: for example, the Bell System was a for-profit company that held a virtual monopoly on phone service in the US from early in the 20th century until 1984, and it worked. Bell was strongly regulated, both that their prices and services they were required to provide were publicly regulated, and that they were required to keep advancing the technology. Changing technologies, many of which had been created by Bell Labs, convinced regulators and the courts that it was no longer possible to do this. This was a disaster for society, in many ways. It created a bunch of new billionaires, but it created lots of what could be called "parallel monopolies", each of which has all the bad properties of the old monopolies, but there are more of them that we must deal with.
We must fix this. Ultimately, we need to set things up so that no functional monopoly is allowed to exist without regulation that prevents enshitification. As a fan of markets, I believe the best way would be to enforce rules that prevent any market from having too few competitors to keep it really free. I cannot think of a circumstance where this is fewer than a dozen roughly equal competitors, and probably more. There are also circumstances--and the phone company of old is a perfect example, where there are huge structural advantages to having a monopoly. That monopoly needs to be regulated so that it provides a comfortable income for its workers and shareholders, but its growth is limited. This would not inherently disallow competition: GTE competed with Bell in the old days. I think the modern version would be a small number of tightly regulated collaborating companies providing the coax, optical fiber, microwave and cellular networks, with service providers licensing these carriers to provide specific services. The carrier companies would be required to cover every place and everybody for the same price and service quality, and allow "roaming" at no cost--you shouldn't need to know which carrier you're using, or need to be in some special place.
Of course, doing this massive regulation, and in many cases, massive government-run operations, would require taxation. During the time that most people think America was at its greatest: 1933-1980, taxation was extremely progressive, and the same attitude that led to that led to competent monopoly enforcement. Income over $400K was taxed at 91% marginal rate for much of the 1950s, and it worked extremely well. Today, the top marginal rate is about 1/3rd of that. And the billionaires are running amok--the worst of them are monopolies (including the host of this blog...). We must stop this.
I say: we need a progressive tax rate that creates a lot of revenue for public sector without hurting people who can't afford it. Here;s my thinking:
income less than 2/3rds of median income ($50K): 0% tax
income between 2/3ds and double median ($150K): 10% marginal tax
various rates in the middle here, which I'll leave blank for the moment.
income over 25M: 70% marginal tax
income over $1B: 95% marginal tax
All income should be taxed, with NO mechanism for diverting income into lower-taxed brackets, such as carried interest, borrowing against assets, dividends, long term capital gains, allowed. The top brackets may seem punitive, and to some degree they are. Billionaires hurt society. There are a few who do good things with their money, but too many use their money for bad.
There are ways for $billion earners to avoid taxes: put large dollar values into actual charitable causes, like building schools, subsidizing food programs, etc, and they deserve a deduction for this.