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Income elasticity of demand when national income rises

When diamond sales jump from 3 to 13 million carats yearly while a strong recovery increases national income from $12.0 trillion to $13.2 trillion, in that case the income elasticity of demand for diamonds is: (1) 0.76. (2) 1.52. (3) 3.04. (4) 6.07. (5) 13.125

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