Gold, silver, bronze
Throughout history, human societies have exhibited three social classes, and it was even quite typical, for example, in the ancient Mediterranean to see three coins circulating: gold, silver, bronze
What has changed throughout history is the percentage of the population belonging to each social class.
Perhaps in the United States today (ca. 2025):
Gold: 10%
Silver: 40%
Bronze: 50% (?)
At the top, we would have to include another class (1%: platinum, uranium, or kryptonite for the oligarchy), and at the bottom, a very impoverished class perhaps sized at 10%.
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George Carlin summed up perfectly (and early) what is now obvious except to the blind and deaf who live within the Colosal Media Bubble of the British Empire Heirs Club (USA, Canada, UK, European Eunuchs, Aus and NZ)