Very well done indeed.   It may be the most morally challenging issue of the decade.  

We are one of only two countries in the world (last time I checked), that allows drug manufacturers to use direct marketing.   The market apparatus is complex and it's done with connections reaching to your family doctor, (the front line salesperson by intent or not)     Who turns down the 'new' drug, especially if your insurance is paying?  

Doctors prescribing practice can be traced, are traced, through pharmacy records on sales.   It may not violate privacy law, but it's a heck of a tool for analyzing and manipulating pricing for maximum profit.  It also provides a 'reward' incentive of business trips; 'free' samples to get your patients hooked; speaking fee's endorsing drug products. 

 Just one piece of the puzzle of to why Americans pay so much for drugs.   There are many more.