求翻译：正常物品和低档物品的区别是：正常物品的需求量与消费者的收入水平成同方向变动，而低档物品的需求量与消费者的收入水平成反方向变动。正常物品和低档物品的区别对它们各自的收入效应产生影响。正常物品的收入效应与价格成反方向变动。低档物品的收入效应与价格成同方向变动。是什么意思？

Normal goods and inferior goods is the difference between: normal demand and consumer goods into the same direction of changes in income levels, and low demand for goods and consumer income levels into the opposite direction. The normal distinction between goods and inferior goods the income effect

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The normal goods and the low-grade goods difference is: The normal goods demand and consumer's income level becomes the same direction to change, but the low-grade goods demand and consumer's income level becomes the reversed direction change.The normal goods and the low-grade goods difference has t

Normal goods and low-grade goods is the difference between normal goods and consumers ' demand for changes in the level of income into the same direction, and low-grade goods and income level of consumer demand for change in the opposite direction. Normal goods and low-grade goods have an impact on