As the video linked here shows, there is some evidence linking greater wealth to a greater chance of being more of a jerk. Assuming that we're talking about humans or a sapient race with more or less human psychology, at least in this area, how might this tendency be fought against? The best idea I have so far is having rich kids perform certain chores to get them to appreciate their wealth.
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So first off to say that you don't have to be rich to be a jerk. I know plenty of people who aren't rich, and who are assholes.
Second, saying that rich people are jerks is stereotyping to the same extent as to say that women are bad drivers or that poor people are lazy.
I also know several rich people that do a lot of good for the local community and are definitely not jerks.
But for the sake of argument let's suppose this is an alternate world where what you say is mostly true. I'm also going to interpret "Jerk" as someone that puts themselves and what they desire over the needs of others or society, and a society that puts emphasis on making sure that people in general are better human beings.
So I propose a society where there is a law requiring all young people to serve in some kind of peace corps, similar to how some countries have laws forcing all citizens to serve in military service.
Rich and poor, they all have to take some time working "in the trenches", helping those in need and giving to society. During their time they don't have access to their families wealth so everyone is equal, working side by side.
This will help teach "the rich" that poor people are people too.
And it will help teach "the poor" that rich people are people too.
And it'll teach everyone about empathy and the value of hard work.