77: I didn't read the title in full before I read the chapter. I must admit that "Sunk Costs" weren't a lesson that sprung to my mind as I read. Since sunk costs are such an important lesson to convey I rather hope there is another chapter on the subject. It strikes me as something that is easy to contrive scenarios to illustrate.
I was actually wondering more about the “Interlude with the Confessor” part. Is it non-obvious only to me? There’s a chapter with that name in Three Worlds Collide, but other than both containing a private dialogue between two people of different ages I don’t quite see the relation.
Update: Discussion has moved on to a new thread.
The hiatus is over with today's publication of chapter 73, and the previous thread is approaching the 500-comment threshold, so let's start a new Harry Potter and the Methods of Rationality discussion thread. This is the place to discuss Eliezer Yudkowsky's Harry Potter fanfic and anything related to it.
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven. The fanfiction.net author page is the central location for information about updates and links to HPMOR-related goodies, and AdeleneDawner has kept an archive of Author's Notes.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: