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The crude oil "supply gap" risk

Photo: Dave Walsh / VW Pics / UIG via Getty Images

A big question among oil experts these days is whether today's worldwide investments in new supplies are too low to avoid risk of a "supply gap" opening up in the early 2020s as demand grows and existing fields decline.

The big picture: Two competing views presented this week offer a pessimistic and optimistic take on the situation, taking on opposite sides of the investment debate.