There are official data over time called the Gini index or coefficient between zero and one that is a statistical measure of economic inequality. When it is zero national income is evenly distributed among all citizens, and when it is one all the income goes to one person. Obviously the Gini figure will be somewhere between zero and one. Some nations have very low values and others very high ones. In the high category is the US. But more important is that the index has changed over time, rising from about 1980 to current times, after it had remained fairly stable over several decades. That significant rise from about .37 to .45 shows unequivocally that the rich got richer as most of the population in the middle class and below lost ground.
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