The first reason for the inverse relationship between price and quantitydemanded is that people substitute lower priced goods for higher priced goods.The second reason has to do with the law of diminishing marginal utility, whichstates that for a given time period, the marginal utility gained by consuming equalsuccessive units of a good will decline as the amount consumed increases.
D.Individual Demand Curve and Market Demand Curve
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E.A Change in Quantity Demanded Versus a Change in Demand
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F.What Factors Cause the Demand Curve to Shift?
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G.Movement Factors and Shift Factors
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Solution : The inverse relationship between price of the commodity and quantity demanded for that commodity is because of the following reasons: <br> (i) Income effect : <br> (a) Quantity demanded of a commodity changes due to change in purchasing power (real income), caused by change in price of a commodity is called Income Effect. <br> (b) Any change in the price of a commodity affects the purchasing power or real income of the consumers although his money income remains the same. <br> (c ) When price of a commodity rise more has to be spent on purchase of the same quantity of that commodity. Thus, rise in price of commodity leads to fall in real income, which will thereby reduce quantity demanded is known as Income effect. <br> (ii) Substitution effect : <br> (a) It refers to substitution of one commodity in place of another commodity when it becomes relatively cheaper. <br> (b) A rise in price of the commodity let coke, also means that price of its substitute, let pepsi, has fallen in relation to that of coke, even though the price of pepsi remains unchanged. So, people will buy more of pepsi and less of coke when price of coke rises. <br> (c ) In other words, consumers will I substitute pepsi for coke. This is called Substitution effect. <br> Price effect = Income effect + Substitution effect <br> (iii) Law of Diminishing Marginal Utility: <br> (a) This law states that when a consumer consumes more and more units of a commodity,every additional unit of a commodity gives lesser and lesser satisfaction and marginal utility decreases. <br> (b) The consumer consumes a commodity till marginal utility (benefit) he gets equals to the price (cost) they pay, i.e., where benefit = cost. <br> (c ) For example, a thirsty man gets the maximum satisfaction (utility) from the first glass of water. Lesser utility from the 2nd glass of water, still lesser from the 3rd glass of water and so on. Clearly, if a consumer wants to buy more units of the commodity, he would like to do so at a lower price. Since, the utility derived from additional unit is lower. <br> (iv) Additional consumer: <br> (a) When price of a commodity falls, two effects are quite possible: <br> New consumers, that is , consumers that were not able to afford a commodity previously, starts demanding it at a lower price. <br> Old consumers of the commodity starts demanding more of the same commodity by spending the same amount of money. <br> (b) As the result of old and new buyers push up the demand for a commodity when price falls.
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Solution
When the price of a good falls, it has the following two effects that lead a consumer to buy more of that commodity.
(i) Income effect: When the price of a commodity falls, the real income of the consumer, i.e., his purchasing power increases. As a result, he can now buy more of a commodity. This is called income effect. This causes increase in the quantity demanded of the good whose price falls.
(ii) Substitution effect: When the price of a commodity falls, it becomes relatively cheaper than others. This induces the consumer to substitute the cheaper commodity for the other goods which are relatively expensive. This is called as the substitution effect. This causes increase in quantity demanded of the commodity whose price has fallen.
Thus, as a result of the combined operation of the income effect and substitute effect, the quantity demanded of a commodity increases with a fall in the price.
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