The driver was the OPEC oil reduction. Who negotiated that? You’re like a kindergartener.
Nobody did.
The world was awash in oil in 1985, and Saudi Arabia had been reducing production in order to keep the cartel price up.
Venezzuela, Mexico and Nigeria, routinely ignore their production quotas and flooded the market, undermining OPEC.
A big driver was a flattening out of growth in demand for gasoline in the United States, due to the CAFE standards, which nearly doubled the gas milage of the American passenger fleet in the decade that preceeded it.
In the Spring of 1985. Saudi Arabia increased production and the cartel price collapsed.
No one negotiated anything. The marketplace took care of it.
That will happen again once the Fool in the White House figures out how to declare fake victory and quit the war he started.
And, the level of investments in renewables will increase.
After all, only fools would rather send their sons to war for oil, when they can send their sons to research universities in search of the future.