The class is going over about the Law of Supply and what it states. Michael is trying to give the answer and during that, he says "Quality" instead of "Quantity" and the teacher is telling him "Come on! Spit it out!"

When Michael corrects himself, the teacher says "Ah! You're hopeless!".

Then, he calls on Zoey to answer the question. She gets it wrong and the teacher goes "Ah!" Then, he calls on Stacey but she shrieks in fear and he skips her. He calls on Chase and he gets the question right. The teacher goes "Yes! Hooray! Someone finally said something intelligent!" Then, he calls on Logan to answer about what the two main branches of economics are and he goes "Uhh..."

The teacher says "No! Not 'Uhh...' " Zoey asks him if she can get an aspirin from the nurse and he says "No. Aspirin is for the weak." Last, he calls on Stacy to tell who Adams Smith was. She says "A political economist and mortal philosopher?"

Then, the teacher asks her what country Adams Smith was from. Here's the line:
Stacey: "Switzerland?"
Teacher: "Wrong."
Stacey: "Sweden?"
Teacher: "Wrong."
Stacey: "Scotland?"
Teacher: "Yes, but your shirt is hideous."
*Stacey cries and runs out the door.*
Zoey 101 (episode: Curse of PCA)