In the event the blood supply to any one of the parathyroid glands is endangered through surgery, the parathyroid gland(s) involved may be re-implanted in surrounding muscle tissue.
Taken together, these effects mean there is now an excess supply (known as a surplus) of the product in the market to maintain the price floor over the long term.
The supply and demand model is a partial equilibrium model where the clearance on the market of some specific goods is obtained independently from prices and quantities in other markets.