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The drugs were chosen simply as the most significant ones for the AARP's membership. The methodology is thoroughly discussed in Appendix A of the study:

http://member.aarp.org/content/dam/aarp/ppi/2014-11/rx-price...

Also note that the drugs were chosen before they started tracking prices.

I totally understand your skepticism, but rather than just wonder why they chose those, why not find out?

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They did find out. Why go digging when you could just make a comment and get all the work done for you.

That's the internet for you. Ask a question and nobody answers, state the wrong answer and you get the right answer instantly. It's not my fault, I'm a victim of an oppressive system!

Cunningham's Law: https://meta.wikimedia.org/wiki/Cunningham%27s_Law

Haha.. good job calling me out!

You are correct, I could have done some background reading before my "drive by" post.

Lesson learned!

Cheers!

To be fair, I really wish news organizations would do a better job of linking to their sources. In this case, you have to notice a link in the story, then dig up the link to the actual study from that. There really should be a direct link to the study from the chart's caption, made obvious for all to see.

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