A demand schedule is a table that shows the different quantity of a good demanded for different price levels. Demand curve on the other hand, shows how demand for a commodity varies with change in the price level. As the name suggests demand schedule is a table, while demand curve is a graph. They are both related as demand schedule is needed to construct the demand curve.
A normal good is the one whose demand is positively related to the income level. In other words, as the income increases the demand for normal good increases and visa-versa. On the other hand, in the case of inferior good, the demand is negatively related to the income level. In other words, as the income increases the demand for inferior good decreases and visa-versa.
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