What is the difference between the upper-upper class and the lower-upper class? Why do social scientists have so little information about such families?

Name: What is the difference between the upper-upper class and the lower-upper class? Why do social scientists have so little information about such families?
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The Answer of What is the difference between the upper-upper class and the lower-upper class? Why do social scientists have so little information about such families?

What Is the Difference Between the Upper-Upper Class and the Lower-Upper