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If this is a economic winner, I would have already expected it to be done informally already by hustling undergrads... is it common?

Going only off of personal experience I frequently swapped or loaned books within my social circle. Already had trust established and knew where I could get my hands on them. Facebook app facilitating trading between established connections?

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I think a big barrier is making it easy for students to complete a transaction. Students with a social circle (fraternities, etc.) may not find as much value as students without big social circles. I had a social circle but they all needed the same books as I did.

Also, we don't expect this to be useful for every single student. We're looking to identify a niche and provide an excellent experience for them.

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