The price for crude oil produced by the Organization of the Petroleum Exporting Countries (OPEC) fell by 0.88 dollars last Friday, OPEC announced Monday. One barrel (159 liters) of OPEC-produced crude stood at 128.56 dollars a barrel on Friday, compared with 129.44 dollars on the previous day, DPA reported. OPEC calculates an average basket price based on 13 important brands produced by cartel members.