None of the richest men in the world

Are inventors.

[Citation Needed]

Depends on your definition of "world"

>>3-kun, please select which world you deemed most likely to represent >>1-kun's meaning:

[_] Personal world - Yourself and your family.

[_] Local world - Your city or rural area.

[_] Regional world - Your region, like the Inland Empire or the Adirondacks.

[_] Statist world - Your nation-state.

[_] Civilizational world - Your type of civilization, like Slavic-Europe or the West.

[_] Human world - All peoples.

[_] Biological world - All biological organisms.

[_] Geophysical world - From red depths to black skies.