PennEd, I'll let Dr. Ryan Anderson explain <skip to 2:30>:
[video=youtube_share;YWIhZ5xJJaQ]http://youtu.be/YWIhZ5xJJaQ[/video]
[video=youtube_share;YWIhZ5xJJaQ]http://youtu.be/YWIhZ5xJJaQ[/video]
He has laid out exactly the arguments I have been making for almost 2 decades.