Step 1: Pogge's Argument on Global Justice.
Thomas Pogge, a philosopher specializing in global justice, contends that a significant disparity exists between the world's wealthy and impoverished populations. He attributes this inequality, in part, to the current global economic structure and asserts that developed nations have a moral responsibility to mitigate this imbalance.
Step 2: Evaluation of Potential Candidates.
- (1) John Rawls: While Rawls developed a theory of justice, his work primarily addresses justice within individual societies, not global disparities.
- (2) Amartya Sen: Sen has addressed global poverty and justice; however, his emphasis on the wealth gap between rich and poor is less pronounced than Pogge's.
- (3) Thomas Nigel: This name is incorrect. No prominent scholar with this name is known for arguments about global inequality.
- (4) Thomas Pogge: Correct. Pogge is well-known for arguing that global poverty stems from unjust global systems.
Step 3: Final Answer.
Therefore, the correct choice is (4) Thomas Pogge.