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Why does Demand Curve Slopes Downward?
Last updated date: 01st Jan 2023
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The demand curve in economics is defined as the graphical layout of the relationship between the product price and quantity of the product demanded. The demand curve is drawn with the price and product quantity demanded shown on the vertical axis and the horizontal axis of the graph respectively.
With a couple of exclusions, the demand curve always slopes downward from left to right direction because price and quantity demanded of the product are conversely related to each other i.e. with decline in the price of the product, the quantity demanded for such products will increase. This relationship of product’s price and quantity demanded is dependent on certain ceteris paribus (other things being equal) conditions remaining constant.
Such conditions include the total number of consumers in the market, consumer’s price expectation, price of the substitute goods, consumers taste and preference, and personal income. A change in one or more of the above mentioned conditions brings about a shift in the location of the demand curve. A shift to the left represents a decrease in demand whereas a shift to the right indicates an increase in demand.
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What is the Demand Curve?
The demand curve is the graphical representation of the number of units or commodities purchased for each of a range of conceivable prices. It represents the relation between the unit of commodities and the price of goods or services. The diagram given below shows a typical demand curve, where the price is shown on the vertical axis, and the quantity demanded is shown on the horizontal axis. This is the precise relationship between demand and price. Generally, the demand curve slopes downward (i.e.its slope is negative) because the number of unit demands increases with a fall in price and vice versa.
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Higher price results in lower demand whereas low price results in higher demand.
What Are The 7 Major Causes of Downward Sloping Demand Curves?
The 7 major causes of downward sloping demand curve are as follows:
1. Law of Diminishing Marginal Utility
The law of demand relies upon the law of diminishing marginal utility. According to the law of diminishing marginal utility, as consumers buy more units of a commodity, the marginal utility of that commodity continues to decline. Therefore, consumers will buy more units of commodities only when the price of that product begins to fall.
The utility will be high when fewer units are available and consumers will be prepared to pay more for that commodity. This proved that there will be higher demand when the price falls and lower demand when the price rises. This is why the demand curve is sloping downwards.
2. Price Effect
Every commodity has certain consumers, when the price of the commodity falls, new consumers start consuming it, as a result, demand increases. On the other hand, with the increase in the price of the commodity, many consumers will either reduce or stop its consumption, and as a result, demand decreases. Therefore, due to the price effect, the demand curve slopes downward when consumers consume more or less of the commodity.
3. Income Effect
When the price of a commodity decreases, the real income of the consumer increases because he has to spend less in order to buy the same quantity of that good. On the contrary, When the price of a commodity increases, the real income of the consumer decreases. This is termed as income effect.
Under the influence of the income effect, with a fall in price, the consumer will buy more units of that commodity and also spend a portion of income in buying other commodities. For example, with the fall in the price of milk, he will buy more of it but at the same time, he will increase the demand for other commodities.
On the contrary, with an increase in the price of the milk, he will reduce its demand. The income effect of change in the price of the commodity being positive, the demand curve slopes downward.
4. Income Group
There are different people in different income groups in every society but the majority of the people fall in the low-income group. The downward sloping of the demand curve also relies on the income group of the people. Ordinary people buy more when the price of the commodity falls whereas they buy less when the price rises. The rich do not affect the demand curve as they are well capable of buying more commodities even at high prices.
5. Different Uses of Certain Goods
The different uses of certain goods and services are also accountable for negative sloping demand curves. With the increase in the price of such goods, they will be used only for more important uses and accordingly the demand for such goods will fall. On the other hand, with a fall in price, they will put to various other uses, and accordingly, their demand will rise.
6. Substitution Effect
The substitution effect is another reason for the downward sloping demand curve. With a fall in the price of the commodity, and the price of its substitutes remaining the same, the consumer will buy more units of that commodity. As a result, demand will increase. On the other hand, with a rise in the price of the commodity, and the price of its substitutes remaining the same, the consumer will buy fewer units of that commodity. As a result, demand will decrease. For example, as the price of tea declines, and the price of coffee being unaffected, the demand for tea will rise, and conversely with an increase in the price of the tea in the market, its demand will fall.
7. Tendency To Satisfy Unsatisfied Wants.
There is always a human tendency to satisfy unsatisfied wants. Each and every person has some unsatisfied wants. When the price of goods, such as apples, falls, the consumer will buy more of that commodity as he wants to satisfy his unsatisfied wants. As a consequence of this habit of humans, the demand curve slopes downward to the right.
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Frequently Asked Questions About why do demand curves slope down and to the right
If you have questions that need to be answered about the topic why do demand curves slope down and to the right, then this section may help you solve it.
What causes demand curves to slant downward and to the right?
The demand curve slopes down to the right due to the first law of demand, which states that as price increases, less quantity is demanded. (Because price and quantity move in opposite directions on the demand curve, the price elasticity of demand is always negative.)
Why does this curve have a left-to-right downward slope?
The investment demand increases when the interest rate decreases, and this increase has a multiplier effect on consumption, increasing national income and product as a result.
What causes a rightward shift in the demand curve?
Demand Curve Shifts Right When the economy is booming, buyers’ incomes will rise, and they’ll buy more of everything, even though the price hasn’t changed. This means more of the good or service are demanded even though there isn’t a change in price.
Why does a left to right brain demand curve slope downward?
Because there is an inverse relationship between the prices of goods and their demand, the demand curve does indeed slope downward from left to right. Demand is the quantity of particular goods that consumers want to purchase from the market.
Quizlet: What causes the demand curve to slant to the right or left?
Any change that makes the quantity demanded at every price less is known as a decrease in demand, while any change that makes the quantity demanded at every price more is known as an increase in demand, which causes the demand curve to shift to the right.
What are the three causes of a demand curve that slopes downward?
Pigou’s wealth effect, Keynes’ interest-rate effect, and Mundell-Fleming’s exchange-rate effect are the three fundamental explanations for the downward sloping aggregate demand curve; they are separate but complementary.
What are the top five reasons why demand swings to the left or right?
Changes in tastes, population, income, the cost of substitute or complementary goods, and expectations regarding future conditions and prices are just a few of the variables that can cause the demand curve for goods and services to shift, resulting in a different quantity being demanded at any given price.
What does it mean when the demand curve slopes downward?
a demand curve demonstrating how demand declines as price rises.