In a supply curve, the output may or may not be independent of the input variable.
According to the graph, the output remains constant.
From the complete question (see attachment), we have the following observations
- The supply (long run) is represented by a vertical line
- Irrespective of the price, the supply (long run) remains unchanged
The above highlights mean that:
No matter the value of the price, the total economic value remains unchanged.
This means that, in the long run, the output will remain constant
Hence, (a) output remains constant is correct
Read more about supply curves at:
https://brainly.com/question/6075885
