and others more unexpected. Perhaps one of the most natural has been a new-found enthusiasm for puzzles, with the completion of tricky, 1000-piece, single-hued jigsaws the highlight of self-isolation ...

Lerner, Josh. "The Empirical Impact of Intellectual Property Rights on Innovation: Puzzles and Clues." American Economic Review: Papers and Proceedings 99, no. 2 (May 2009): 343–348. (Earlier version ...