But it's probably not the price in the exchange. My dad works for 中石化. I remember they had a hedging program and one year they hedge the price at 10 but the actual was 7 so it losts a lot of $. I was in Grade 1~4 (can't remember exactly). I was too little...
either your memory is wrong or it was a different oil, never below 20 in 80s
-vicky2005(孩子她爹);
2020-4-20(#12883106@0)
If could well be. Or they were referring to other measurement units...
-jeffrey815(Smartiecat);
2020-4-20(#12883119@0)