CORRECT answer is 'has barely yielded any result'.The answer can be decided LOOKING at the line- 'In the field of economics, the TREE of ideology has never bore any fruit. We have opportunities multiply when they are seized, they die when neglected. We have barely tapped our immeasurable potential for growth'.The PASSAGE deals with how opportunities die when they are neglected and how we have barely tapped our immeasurable potential for growth. Moreover, never bore any fruit means never resulted into anything good.Thus, ideology in the context of economics 'has barely yielded any result'.