Free Variable Economy

I am very grateful to an LI reviewer for extremely sharp and constructive feedback, and in particular for pointing out to me the relevance of examples like (35) and (41). Also, I am very grateful to Maria Aloni, Rajesh Bhatt, Liz Coppock, Paul Dekker, Danny Fox, Jeroen Groenendijk, Irene Heim, Kyle Johnson, Salvador Mascarenhas, Tanya Reinhart, Eric Reuland, and Philippe Schlenker for encouragement and feedback at various stages.