Refer to the diagram above, which shows three supply curves for corn. A movement from point a to point b is caused by a change in the

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The movement from point a to point b represents an increase in quantity supplied, which is caused by a change in the price of corn in the market. The supply curves themselves represent different levels of production costs, so changes in factors such as the price of resources or technology would shift the entire curve, rather than causing a movement along it. The number of corn farmers may also impact the overall supply of corn, but this is not specific to the movement from point a to point b.

Refer to the Diagram Above, Which Shows Three Supply Curves