Is this really the full story? Why did then the whole world follow suit (in using TEL instead of e.g. ethanol)? Here it seems the reason was production cost of

Is this really the full story? Why did then the whole world follow suit (in using TEL instead of e.g. ethanol)? Here it seems the reason was production cost of TEL was lower than ethanol: https://www.eesi.org/papers/view/fact-sheet-a-brief-history-of-octane https://www.eesi.org/papers/view/fact-sheet-a-brief-history-... Also, since there were less cars when this was decided and supposedly low dosage risk of lead was only known in the 60s, the original article seems to follow a bit of a narrow narrative. (For the workers the high risk was probably known though)