High floating dollar oil prices cause low oil prices, later. Low floating dollar value oil prices cause high prices, later. Stable fixed dollar values cause stability, boring prices.
Todays Oil prices are all the way back to 1985. Before they de-pegged the Dollar in 1970 oil was $3.60/bbl. Adjusted for inflation? Oil is back to 1946 price. Ask ourselves, what did $20 buy in the 1940s?
https://www.mrci.com/pdf/cl.pdf
“$20 in 1940 is equivalent in purchasing power to about $342.87 in 2016, a difference of $322.87 over 76 years.”
https://www.dollartimes.com/inflation/inflation.php?amount=20&year=1940