Your mortgage payment is constant through time but the fraction of it that goes to paying off principal versus interest changes through time and it just changes as dictated by this formula.
There are four possible divisions that Pfizer could spin off: baby formula, over-the-counter products, veterinary medicine, and established products, which includes generic drugs.
Barbara Ryan, the pharmaceuticals analyst at Deutsche Bank, wrote in a note to investors that she expects Pfizer to at least spin off the baby formula and o-t-c units.
