Morgan Stanley analysts recently included this chart of crude production costs. Onshore Middle East oil sites are much cheaper to tap than North American shale, which costs about $65 per barrel to extract.
1. ponder-reflect deeply on a subject; I mulled over the events of the afternoon; philosophers have speculated on the question of God for thousands of years; The scientist must stop to observe and start to excogitate.
Meaning: Stubbornly unyielding. Synonyms: dogged; dour; pertinacious; unyielding; tenacious. Context examples: dogged persistence / dour determination / the most vocal and pertinacious of all the critics / a mind not gifted to discover truth but tenacious to hold it / men tenacious of opinion. Similar: