What do the authors of the text mean when they say that an "aggregate supply curve" in the traditional sense of the word supply does not exist?

Question

Quizplus · Accepted Answer

The Answer is They are arguing that because input prices change when the overall price level changes and because many firms in the economy set prices as well as output it is perhaps not valid to speak of the aggregate supply curve as a market supply curve.

What Do the Authors of the Text Mean When They