A shift in the supply curve is brought about by a change in supply. Changes in production cost and related factors can cause an entire supply curve to shift right or left.

A supply curve will shift to the right when there is an increase in the change in supply, and it will shift to the left when there is a decrease in the change in supply.

Some of the factors that may cause a supplier to be unable to supply to the market include;

- changes in the costs of production.
- changes in technology.
- population size.
- government taxes/subsidies/regulations.
- weather conditions.
- wars/disaster