[epistasis]

The price response in secondary markets (refurbished drives here) can be much bigger than the direct effects caused by increases in price for newly produced goods, I think? If the price goes up for new drives, purchasers of new drives hold on to current product for longer, and they are the suppliers to the secondary market. Also, more people might buy from the secondary market than from the primary market due to the price increase, creating a greater supply pressure and price response than is seen in the primary market. I guess it all depends on the shape of the demand curve.