Assertion: sanction | /r/CapableOf | prompt many oil companies
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text: Sanctions have reduced Iran's access to products needed for the oil and energy sectors, have prompted many oil companies to withdraw from Iran, and have also caused a decline in oil production due to reduced access to technologies needed to improve their efficiency.[citation needed]According to Undersecretary of State William Burns, Iran may be annually losing as much as $60 billion in energy investment.