 What does removing price barriers mean for readers?
A price tag is a significant access barrier. OA removes price barriers. Removing price barriers means that readers are not limited by their own ability to pay, or by the budgets of the institutions where they may have library privileges. While every kind of OA removes price barriers, there are many different permission barriers we could remove if we wanted to. If we remove price barriers alone, we provide gratis OA , and if we remove at least some permission barriers as well, we provide libre OA . If there are complexities, they lie in the transition from where we are now to a world in which OA is the default for new research. This is complicated because the major obstacles are not technical, legal, or economic, but cultural.
 Readers are not limited by their own ability to pay.
 Readers are not limited by the budgets of libraries.  Readers can translate and redistribute work.  Readers can reuse literature for scholarly purposes.  Readers are not limited by their own ability to pay.