Other things equal, extracting oil from shale becomes economically viable (same or lower cost than using conventionally extracted oil)when oil prices reach _____ or more per barrel.

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The Answer of Other things equal, extracting oil from shale becomes economically viable (same or lower cost than using conventionally extracted oil)when oil prices reach _____ or more per barrel.

Other Things Equal, Extracting Oil from Shale Becomes Economically Viable