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Income elasticity for Good A is -0.5. It means that when income increases on one point, consumption of this Good A decreases on 0.5 points. It can be some cheap product, which person could eliminate from its consumption basket when income increases. Income elasticity for Good B is 4. It means that when income increases on one point, consumption of this Good B increases on 4 points. It can be some basic product, which person could not eliminate from its consumption basket and tries to consume more with income increase.