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The phrase "the principal driver" is correct and usable in written English.
You can use it to refer to the most important person or factor influencing a particular result or process. For example, one might write, "Time pressure was the principal driver behind the project's failure."
Exact(52)
That leaves interest on the debt as the principal driver of long-term spending and deficits.
"I think that that economic vision is really the principal driver".
Ms. Cloyd told agents that her son Matthew was the principal driver of the S.U.V.
Revenues should not be the principal driver of programs, and many shows have been perceived to be just that.
"Fossil fuels, which are the principal driver of climate change, require the sacrifice of whole regions and people.
John, the principal driver, told them kitchen equipment & food were stored in the bus & they would be cooking vegetarian meals along the way.
Similar(7)
Advanced technology is indeed one of the principal drivers of accelerating health costs in the United States.
"We're faced with weakness in the two economies that have been the principal drivers of Asia," Mr. Jovanovich said.
Rather, Pfaff points to prosecutors — more than cops, judges, or legislators — as the principal drivers of the increase in the prison population.
Culture generates desires – for vehicles and appliances, for certain kinds of gardens and dwellings – that are among the principal drivers of the carbon economy.
He said that the decline in the dollar had "contributed somewhat" to higher oil prices but insisted that the "principal drivers" were supply and demand.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com