We develop a model of unforeseen contingencies. These are contingencies that are understood by economic agents ' their consequences and probabilities are known' but are such that every description of such events necessarily leaves out relevant features that have a non-negligible impact on the...

We develop a model of undescribable events. Examples of events that are well understood by economic agents but are prohibitively difficult to describe in advance abound in real-life. This notion has also pervaded a substantial amount of economic literature. We put forth a model of such events...