Chapter 2

Supply

Supply is the quantity of a good producers are willing and able to sell at each price, and it normally rises as price rises.

What supply means

Supply is the quantity of a good or service that producers are willing and able to sell at each possible price over a period of time. Higher prices usually make selling more profitable, so producers offer more for sale.

Key idea

The law of supply: as the price of a good rises, the quantity supplied rises, other things equal. So the supply curve slopes upward from left to right.

Movements along the curve

A change in the price of the good itself causes a movement along the supply curve. A rise in price causes an extension (more supplied); a fall in price causes a contraction (less supplied).

Example

When the market price of oranges rises, farmers offer more oranges for sale. This extension in supply is a movement up along the same supply curve.

Shifts in supply

A change in a factor other than price shifts the whole curve. Supply rises (shifts right) with lower costs of production, improved technology, better weather for crops, lower taxes or a subsidy. Higher costs or new taxes shift supply left.

Remember

  • Price change → movement along the curve.
  • Non-price change → shift of the whole curve.
  • Lower production costs increase supply.

Stuck on this topic? A verified JomKelas tutor can walk you through it.

Find a verified tutor