What isn't getting better is the disparity between the very rich and everyone else. It is getting worse. Which was my point. Which you missed because you wanted to triumphantly plop a Ted Talk in to the conversation.
Oh, you don't understand the maths. Ok.
Let's assume the poorest person in America has zero dollars. There will always be someone with nothing. You can't go below nothing. You can declare bankruptcy if things get out of hand. For the sake of making the maths easy because its simple maths and you are struggling ... the poorest person has zero dollars.
Now, lets assume the richest person in America has $10. The gap between rich and poor is $10.
Let's now assume that America's economy is going well. There is more wealth in it. The poorest will still have $0 because this person is a drug addict with no job. The richest person now has $20.
OMG!
The gap between rich and poor is getting bigger!
And of course it is. The more wealth in a nation, the larger the gap between the rich and the poor. It isn't a sign of inequality. It is a sign of prosperity. Why are you always so envious of other people who have more than you? Just work harder.
The wealth gap increases because there is more wealth. If America only had $1000 dollars in it, the wealth gap could only be $1000 assuming one person had all of it. I'm sure that would make you very happy.