____ as an entry barrier is further strengthened because the major oil companies are vertically integrated. They compete in different stages of production and distribution; that is, both upstream (extraction of oil) and downstream (sale of products to the consumer).

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The Answer of ____ as an entry barrier is further strengthened because the major oil companies are vertically integrated. They compete in different stages of production and distribution; that is, both upstream (extraction of oil) and downstream (sale of products to the consumer).

____ as an Entry Barrier Is Further Strengthened Because the Major