When looking at a graph where potential output is depicted as a vertical line, how do we know this is potential output?



Expert Answers

An illustration of the letter 'A' in a speech bubbles

There are two ways that we can know this.

First, we know it because that is how it is defined.  This is like when we look at a production possibilities curve.  One way we know that the curve represents the most efficient outcomes an economy can achieve is simply because that is the definition of a PPC.  In the same way, we are told that the vertical line represents potential output.

Second, we can know this because of what we see on the graph.  The vertical line is the aggregate supply curve.  We know that the economy can only produce at a point where the aggregate demand curve crosses the aggregate supply curve.  If the aggregate supply curve is vertical, there is no way for this crossing point (equilibrium) to be at a higher level of output (farther right on the horizontal axis) than the vertical line.  Thus, we can see graphically that no greater output can be achieved in the long run.

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial