The one on the right has a toppled L-shape. The one on the left resembles an elongated S. If you believe the poor's prospects are L-shaped, you will tend to believe that they can gradually pull themselves out of poverty, since a small investment (in their livelihood, their education or their health) will yield disproportionate returns, paving the way for larger investments in the future. If, on the other hand, you believe their prospects are S-shaped, you will conclude that the poor are trapped. They need a "big push" to get them out of a rut and onto the sunlit uplands.
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