Originally posted by Parallax In the case of antibiotics, greed isn't the problem; from the medical side anyway. It's a loooong history of combination of doctors prescribing them unnecessarily to placate a patient (or a ped patient's parent) and of patients for whom it was appropriately prescribed not taking it for the full prescribed term. Both cases expose bacteria to the drug but not enough to kill everything, which allows them to build resistance.
In regards to the greed issue, the ag industry's use of them is a different issue.
I suspect another factor is that in some countries, particularly where the doctor sells the medicine to the patient, not a third party pharmacy, the doctor sells a few days' course of AB with instructions to return. But the patient feels a bit better and does not return.
Another thing I have found interesting is the discussion of hospital infections related to resistance of the bugs to the fancy pharmaceutical industry antibacterial chemicals. But I have never heard mention of resistance of bugs to the old traditional cleansing agents such as ammonia, or iodine or alcohol, which worked on gross physical attack rather than subtle biological attack. Somehow the chemical companies have got everyone excited by their better smelling products.