File photo: CGTN

VIENNA, May 6 (Xinhua) -- The Organization of the Petroleum Exporting Countries (OPEC) daily basket price increased to 21.44 U.S. dollars a barrel on Tuesday, compared with 18.36 dollars on Monday, according to OPEC Secretariat calculations released on Wednesday.

Also known as the OPEC reference basket of crude oil, the OPEC basket, a weighted average of oil prices from different OPEC members around the world, is used as an important benchmark for crude oil prices.