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A couple of thoughts on this.
First, Americans who work in physically demanding and/or dangerous jobs such as coal mining, steel manufacturing, auto manufacturing, etc. do not live as long, on average, as the population overall despite comparatively good wages and benefits. I don’t think countries like Iceland and Switzerland have nearly as many people relative to their populations working in these jobs as the U.S. does. Japanese people in the U.S. also live longer than most people. I suspect that it’s due to a combination of diet and genetics. However, as they are here longer and adopt a more westernized lifestyle and diet, they probably don’t live as long as Japanese people in Japan with comparable socioeconomic status do.
Second, regarding social inequality, I think our system, does, to a large extent, reflect our more entrepreneurial culture. While reasonable people can differ about how much taxes should be raised on higher income people to both reduce inequality and raise money for worthwhile public priorities, I think it is important to remember that there could also be economic costs. In Western Europe and Canada, the total tax burden on middle and upper income people generally exceeds 50% of gross income. It’s expensive to sustain a welfare state with a generous social safety net. I think, at the end of the day, those countries, which embraced socialism decades ago, are trading less inequality and more economic security for less economic growth and less opportunity, especially for its younger people.