The underlying notion in this volume is the importance of the new directions that subdisciplines of economics have taken. The contents of this volume – ten essays – give us a broad perspective on the changes that the economics discipline is undergoing. Clearly, there are omissions, and our selection will not satisfy every reader. Putting on our entrepreneurial robe, we canvassed the younger leading scholars and asked them to contribute essays about the direction in which they perceive their area to be moving. The contributors were free to determine their own approach, although we did ask them to minimize the mathematical content to a descriptive level, certainly avoiding proofs in order to make the target audience as broad as possible. We did not find it necessary to use length as an essential criterion for reaching a balanced presentation of the subject areas.