According to the Paper Aircraft Association, a paper airplane thrown in space will not fly; it will float in a straight line forever.

It’s safe to say that the global campaign against the use of plastic straws reached fever pitch this year, with many companies and people choosing to ditch plastic straws in favour of paper ones.

We study the optimal design of a central bank digital currency (CBDC) in an environment where agents sort into cash, CBDC and bank deposits according to their preferences over anonymity and security; ...