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 a

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.