The graphs don't have anything to do with real numbers, but with political perception and way that you would truly represent the result of political action - a swing to the right or left.
Here's why this has no current basis in reality. (All calculating numbers 2012)
Sweden GNP = 420.1 billion PPP dollars
Population = 9.517 million
Per Capita = $44142.00 or .0023% of that GNP
USA GNP = 15.89 trillion PPP dollars
Population = 313.9 million
Per Capita = $50621.00 or .0020% of that GNP
So between the two countries, the per capita GNP is about the same. We aren't different fiscally.
Here's information from 2013:
"Money, while it cannot buy happiness, is an important means to achieving higher living standards. In Sweden, the average household net-adjusted disposable income per capita is 27 456 USD a year, more than the OECD average of 23 938 USD a year. But there is a considerable gap between the richest and poorest – the top 20% of the population earn more than four times as much as the bottom 20%."
Notice that their middle income is higher than the US, and the top 20% earn four times as much as the bottom 20%. That's very different from the US, where "[i]n fact, of course, the top 20% control about 85% of the wealth." That's everything - not just the bottom 20%.
So, it isn't how much money we have, but how we're dispersing it that makes the difference. The second curve suggests that we in the US could well benefit from taking some of Sweden's cues for better living. For Sweden to become more financially prosperous, it suggests that the country might want to find ways to incorporate parts of US culture.