Final answer:
OPEC was trying to raise the price of oil by cutting production, but they couldn't agree due to different production costs. OPEC wants Norway and Britain to join the cartel and cooperate.
Step-by-step explanation:
OPEC was created in the 1960s as an economic alliance to regulate the global oil market. The members of OPEC were trying to agree to cut production so they could raise the price. However, they were unable to agree on cutting production because each country experiences different production costs. The phrase 'do their share' suggests that OPEC would like Norway and Britain to join the cartel and cooperate with OPEC's efforts to control oil production and prices.