As we have seen earlier, a supplier always tries to sell more and more commodities when prices are high, and, conversely, restricts his supplies when prices start falling. This is the underlying law of supply.
The law of supply employs this basic reality in its definition. It assumes that, while other factors determining supply remain constant, price changes will result in changes in the quantity supplied.
The Law of Supply Definition
The law of supply states that "all other factors remaining constant, an increase in the price will result in an increase in quantity supplied and vice versa".
In other words, the law of supply states that there is a direct relationship between price and quantity.
Businessmen, whether producers, sellers, or service providers, tend to release more of their products into the market when prices rise, in order to pocket more profits.
Conversely, when prices fall, they tend to withdraw or restrict stocks to stabilise the prices of their goods.
These variations in the supply chain are studied and controlled by preparing presentations through charts and graphs. They are known as "Supply Schedules" and "Supply Curves" in economics.
Supply Schedule
A supply schedule is a table or chart showing the changes in quantities supplied at varying ranges of the price of a commodity.
Suppose a supplier deals in rice.
At a price of, say, Rs. 50 per kg, the supplier will put into the market all of his stock, say 10,000 kg of rice.
If the price comes down to Rs. 45 per kg, he may sell only, say, 8,000 kg.
If the price further goes down to Rs. 40, he will restrain more and will supply only 5,000 kg.
On the other hand, suppose the price increases from Rs. 50 to Rs. 60 per kg, he will try to procure more stocks from other sources and increase his supplies to 15,000 kg.
The same can be presented through a chart as shown below:
Supply Schedule chart
Price of Rice (Rs. Per kg)
|
Quantity of rice supplied (in Kg)
|
60
|
15,000
|
50
|
10,000
|
45
|
8,000
|
40
|
5,000
|
So, it is clear from the above supply schedule that the supplier decreases his supply quantity when prices fall.
If you view the same chart from bottom to top, you will realise that the supplier has increased his supply whenever the price increased from the previous price.
The same thing can be illustrated through a supply curve also.
Supply Curve
A supply curve is the line or graph connecting all the points representing supply levels at various commodity prices.
So, a Supply Curve can be defined as the graphic representation of the relationship between the price of a commodity and the quantities supplied by the supplier.
The quantities supplied are measured on the horizontal axis and the prices on the vertical axis in the graph below.
Example of Supply Curve:
From the above supply schedule of rice, we can draw the supply curve.
Let us start with the price as 'zero' and quantity supplied also as zero. And then, denote the points from the Supply Schedule.
The supply curve will rise as prices increase, because the supplier will continue to increase the quantity supplied with every price increase, unless he is unable to do so because of other factors affecting supply. In such cases, when he is unable to maintain his supply, the supply curve may begin to fall.
There can be many factors that affect supply. To know the factors affecting supply, you may view the information at this link.
There can be many factors that affect supply. To know the factors affecting supply, you may view the information at this link.
