This introduction sets in context the works that follow, which are meant to take stock of the theoretical advances and also historical changes since the seminal Arrow (1962) and Nelson (1959). First, we summarize some of the original Arrow-Nelson insights. Second, we map the subsequent...

This introduction sets in context the works that follow, which are meant to take stock of the theoretical advances and also historical changes since the seminal Arrow (1962) and Nelson (1959). First, we summarize some of the original Arrow--Nelson insights. Second, we map the subsequent...