That's a very unfounded assertion. I don't see how capitalism is practical. A whole lot of people are really poor. And exercise almost no power. Remember this?
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What's practical about that? Especially when compared with a mentality that can be summed up by admonishing a basketball player who showboats too much and makes his team look bad. One person acts selfishly, and the whole team suffers. He revels in his own success at the expense of everyone else. Sure, maybe his career is fine, but the team in general goes down.
But you wanna talk practical solutions, we'll talk practical solutions.
1) Those dreaded taxes and social programs. They're necessary. Completely necessary. Especially education. And we have to pay for it. It's an investment, not theft.
2) Money out of politics. Totally publicly funded elections. No lobby money, no wealthy donors, no PACs, no special interests. No outside campaigning and keep it within a short span of time. Yeah, it's a first amendment issue. But abridging a little freedom can lead to a lot more effective freedom. Just like abridging the freedom to murder people. There's obviously a line, but the principal is sound. The UK has something like a 6 week electoral process, instead of our two year long presidential elections. This also has the effect of allowing a lot more candidates into the election, since an independent can campaign on the same bankroll as a D or R.
3) Living wages. We should not have a lower class. At all. I don't mean no lowest class. That's impossible. But we need a real minimum standard, and it ought to be what we consider middle class. That's what our vision of America is. Middle class people. Nobody should be below that. That's how we have a healthy, wealthy, and powerful citizenry.
4) Holding businesses accountable for a lot of things they get away with. Shipping money to avoid taxes and jobs overseas should not be allowed. Businesses need to owe a duty to the community and country, not just to one to make as much money as possible for shareholders. That profit is business' only motive isn't a natural law. It's a rule we made up and can change.
5) Change in culture. We are too obsessed with owning things. With material possession. The US has a really messed up idea that property is freedom. It's not. We aren't free because we have this little bit of land that we live on and nobody else can come on and we'll shoot them if they do. That is a backwards 18th and 19th century idea that should be left where it belongs. We're free because we secure our freedom through our common efforts. We're free because there's 300 million other free people watching our backs. We need to curb this out of control individualism to a more reasonable level, and stop obsessing about owning property.
That's just a few points. None of them are terribly difficult. All the framework already exists. It's all 100% constitutional (except maybe the campaign stuff, though we could place it all into a time/place/manner restriction on election-related speech). That might not even displace capitalism, but would at least shape it into something more egalitarian.