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## What is 'Law Of Supply'

The law of supply is the microeconomic law that states that, all other factors being equal, as the price of a good or service increases, the quantity of goods or services that suppliers offer will increase, and vice versa. The law of supply says that as the price of an item goes up, suppliers will attempt to maximize their profits by increasing the quantity offered for sale.

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## BREAKING DOWN 'Law Of Supply'

The chart below depicts the law of supply using a supply curve, which is always upward sloping. A, B and C are points on the supply curve. Each point on the curve reflects a direct correlation between quantity supplied (Q) and price (P). So, at point A, the quantity supplied will be Q1 and the price will be P1, and so on.

The law of supply is so intuitive that you may not even be aware of all the examples around you.

-When college students learn computer engineering jobs pay more than English professor jobs, the supply of students with majors in computer engineering will increase.

-When consumers start paying more for cupcakes than for donuts, bakeries will increase their output of cupcakes and reduce their output of donuts in order to increase their profits.

-When your employer pays time and a half for overtime, the number of hours you are willing to supply for work increases.

The law of supply is one of the most fundamental concepts in economics. It works with the law of demand to explain how market economies allocate resources and determine the prices of goods and services.

## Practical Examples of How Law of Supply Works

The law of supply summarizes the effect price changes have on producer behavior. For example, a business will make more video game systems if the price of those systems increases. The opposite is true if the price of video game systems decreases. The company might supply 1,000,000 systems if the price is \$200 each, but if the price increases to \$300, they might supply 1,500,000 systems.

To further illustrate this concept, consider how gas prices work. When the price of gasoline rises, it encourages profit-seeking firms to take several actions: expand exploration for oil reserves; drill for more oil; invest in more pipelines and oil tankers to bring the oil to plants where it can be refined into gasoline; build new oil refineries; purchase additional pipelines and trucks to ship the gasoline to gas stations; and open more gas stations or keep existing gas stations open longer hours.

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