Adderall Speculation

Students apparently consume mass quantities of the performance-enhancing drug Adderall during exam time. Normally the price is $3 for 10 mg, but it rises during exam week to at least $5.
One student reports that in his suburban Dallas hometown, drug dealers, realizing this price variation, speculated by buying up large supplies of the drug at $3 and dumping them on the market during exam time, hoping to sell at $5.
They didn’t realize that this large increase in supply would cause the price to drop below $5. Indeed, so many dealers engaged in speculation that there was a surplus at the usual equilibrium price of $3. Students were able to buy the drug for only $2 as dealers sold off their excess supply. One imagines that the dealers were less enthusiastic about speculation the next year and that the exam-week price stayed above $3. (HT: AM)