Linear types for cashflow reengineering

Abstract. A while back a major Danish bank approached the programming language group at DIKU for help on designing a language for modelling cash flow reengineering: The process of issuing customised bonds based on income from existing bonds. The idea was to have a simple language that allows non-programmers to describe such reengineering and run statistical simulations of the structures. We describe the problem and present the design of a cashflow-reengineering language based on the dataflow paradigm and linear types. This language has formed the basis of further development by the bank in question and a variant of it is now in use there.