## Law of Demand

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Demand for a product refers to the amount of it which will be bought per unit of time at a particular price. Demand for a commodity depends upon number of factors called Determinants. The demand function can be symbolically expressed as: Generally, it is expected that with a decrease in the price of a commodity, the demand for the commodity increases and with a rise in the price of a commodity the demand decreases. That is, there is an inverse relation between them. Demand for a related commodity depends upon the P R.

There are two types of related commodities, complimentary and substitute:. The demand for goods also depends upon the income of consumers. With an increase in income, the consumer's purchasing power increases, because he is in now in a position to buy more goods. Consequently, the consumer's demand for goods increases. Demand for a commodity depends upon the taste and preferences of a consumer.

A change in taste and preferences affects the level of demand for various goods. Consumer's preferences may change because of changes in fashion, habits, and so on. Future prices of goods also affect their demand particularly for consumer durable goods. Since purchase of durables can be postponed or preponed more easily than those of non-durables.

If for some reason consumers expect prices of certain goods to rise in near future, they tend to demand more for it, in the present even at increasing prices. On the other hand, if they expect prices to fall in the near future, they will demand less of it in the present. Also known as "first law of purchase", explains the inverse relationship between price and demand. Statement of Law of Demand: From the table it is clear that individual consumer demanding more at lower prices and less at higher prices.

This can represented graphically as follows:. X and Y axis respectively represent quantity demanded and price. Demand curve slopes downward from left to right. Demand curve is a curve derived by joining various points showing the quantity demanded and the price of a product. Thus, it indicates there is inverse relationship between price and quantity demanded cet. Thus the law is verified. Law of Demand indicates the inverse relationship between price and quantity demanded of the law of demand states that ceteris paribus an increase in global trade commodity.

It is generally valid in most of the situations. But there are some situations under which there may be direct relationship between price and quantity demanded of a commodity. These exceptions are known as exceptions to the law of demand. It refers to measure of responsiveness elasticity of demand to the change in any of the determinants of demand cet. Elasticity of demand is a ratio of proportionate change in quantity demanded to the proportionate change in any of the determinants.

It is defined as percentage of proportional change in dependent variable result to change in an independent variable. Demand usually varies with prices, but the extent of variation is not uniform in all the cases. In some cases, variation is extremely wide and some cases it is just nominal. And sometimes it may not be responsive. Now to measure this responsiveness or extent of variation economists use the word "elasticity". In measuring elasticity of demand two variables are there: The term elasticity of demand is commonly referred as price elasticity of demand.

This is a loose interpretation of term. Logically elasticity of demand should measure responsiveness of demand for a commodity to changes in the variables confined to its demand function. Hence there are many kinds of elasticity of demand as it's determinants. Economist usually consider three important kinds of elasticity the law of demand states that ceteris paribus an increase in global trade demand: Hence -ve symbol is ignored.

In the above example elasticity of demand is less than one. Hence by using above formula numerical coefficient of price elasticity can be measured from the law of demand states that ceteris paribus an increase in global trade searched given data.