"A fascinating blend of history and ecological economics that uncovers the medieval precedents for modern concepts of sustainable living. In The Green Ages, historian Annette Kehnel explores sustainability initiatives from the Middle Ages, highlighting communities that operated a barter trade...

The focus of this Element is on the idea that choice is hierarchical so that there exists an order of acquisition of durable goods and assets as real incomes increase. Two main approaches to deriving such an order are presented, the so-called Paroush approach and Item Response Theory. An...