Trading 2 written books should give 1 emerald in this case.
But nothing shows up.
Also off topic:
How about making Book and Quill stack, eh?
(#0386 not yet written book)
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Is this still a concern in the current Minecraft version 1.7.5 / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Renaming to the same thing does not allow stacking in the trade menu. I encountered the same bug while trading. Using both slots for written books of different names doesn't work, nor two renamed to the same thing. Only way I was able to get the trade to work was by naming the books "Written Book" when created and stacking them in the first trading slot.
I've found the books need to be named the same when signed, allowing them to stack and both go into the first slot. I'm not sure if that is intended or not with the new trading system...