My main goal in this essay is to say something about leftover open questions in macroeconomics, as well as new phenomena that need to be accommodated in early 21st century macroeconomics, and the sorts of ideas that might make progress possible. The essay first considers foundational questions...

This paper has two objectives. First, it reformulates the theory of optimal use of an exhaustible resource with more attention to the costs of extraction than has been customary in the literature. The output and shadow-price implications of optimal extraction are studied under these broader...