What does Arthur Okun mean when he says that government can redistribute only in a Leaky Bucket?

What does Arthur Okun mean when he says that government can redistribute only in a Leaky Bucket? Explain why he may be right, and why he may be wrong.
How much leakage would you accept? Why? In your answer, consider Rawls’s argument about how people would feel from behind a “veil of ignorance” about their own situation.

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