The Nordics are as capitalist as any most countries and still have billionaires. The difference is that they hold their politicians accountable. They also have strong unions (in fact, there is no minimum wage but rather it is negotiated between unions and employers). They have progressive taxation, and to deter rich people leaving with their assets, Nordic countries have capital flight tax.

The Nordics prove that capitalism with democracy works, but the difference is that they know they have to work for it. A lot of people around the world forget they hold the power as a collective and could pressure their representatives to do the right thing.