Basic Of Economics

Shifts vs Movement

For economics, the “movements” and “shifts” in relation to the supply and demand curves represent very different market phenomena:

1. Movements –
Like a movement along the demand curve, a movement along the supply
curve means that the supply relationship remains consistent. Therefore, a
movement along the supply curve will occur when the price of the good
changes and the quantity supplied changes in accordance to the original
supply relationship.

2. Shifts – A shift in a demand or supply curve occurs when a good’s quantity
demanded or supplied changes even though price remains the same. For
instance, if the price for a bottle of beer were $2 and the quantity of beer
demanded increased from Q1 to Q2, then there would be a shift in the
demand for beer.

Shifts in the demand curve imply that the original demand relationship has changed, meaning that quantity demand is
affected by a factor other than price. A shift in the demand relationship
would occur if, for instance, beer were all of a sudden the only type of
alcohol available for consumption.

Conversely, if the price for a bottle of beer were $2 and the quantity
supplied decreased from Q2 to Q1, then there would be a shift in the
supply of beer. Like a shift in the demand curve, a shift in the supply curve
implies that the original supply relationship has changed, meaning that
quantity supplied is affected by a factor other than price.

A shift in the supply curve would occur, if, for instance, a natural disaster caused a
mass shortage of hops: beer manufacturers would therefore be forced to
supply less beer for the same price.