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Let's say the total GDP over the last 40 years was 300 trillion dollars. Also, let's say Bill Gates's wealth is 100 billion dollars (for ease of calculation).
100B / 300T = 0.003 = .3% of 40 years of GDP
Let's say that the average population of the US during that 40 year period was 170M[0].
170M * 40 years = 6.8B person-years of work (PYoW).
Bill gates contributed 40 PYoW to the GDP, which is 0.000000059% of the GDP.
However, he captured .3% of the GDP as current wealth (not including wealth spent during that 40 years)
That means his wealth capture is 5 million times the "average".
That 'tiny sliver' is anything but.