"Your choice was when you failed to study properly. I gave you a chance."

Were all teenagers this petulant? From his few months experience teaching, Nifty was quickly discovering the answer was yes. Cassidy was mostly quiet in class, but the moody kid apparently liked to run his mouth in one on one conversations. At least he wasn't like his brother, who had to make a smart-ass comment on everything, or the MacHault boy, who Nifty was positive had some kind of brain damage.

Sitting behind his desk, he pulled out Cassidy's red-lined homework. "You seem to be having the most trouble with the AS-AD diagrams. It's not as complicated as you're making it. Look, when demand for goods exceeds supply there's an inflationary gap where demand-pull inflation occurs and the aggregate demand curve shifts upward to a higher price level. When the economy faces higher costs, cost-push inflation occurs and the aggregate supply curve shifts upward to higher price levels." He drew the changes in the curves on the diagram as he spoke, then looked at Cassidy expectantly.