This paper examines the experiment in macroeconometrics, the different forms it has taken and the rules that have been proposed for its proper conduct. Here an ‘experiment’ means putting a question to a model and getting an answer. Different types of experiment are distinguished and the justification that can be provided for a particular choice of experiment is discussed. Three types of macroec...

The paper presents a framework to describe, experiment and study the combination of diierent computational systems including the constraint solving paradigm. Computational systems are interpreted in a rst-order setting thanks to an evaluator that rewrites formulas.

A computational laboratory is a “place” where we can: ask a question about an organization and its processes, build a computational experiment, design and conduct an experiment, and answer or comment on the question. The questions can be: what is, what might be, and what should be. Validation is a fundamental concern in science; the validity of a laboratory and model depends upon the question b...

Economies of scale and scope describe key characteristics of production cost functions that influence allocations and prices on procurement markets. Auction designs for markets with economies of scale are much less well understood than combinatorial auctions, they require new bidding languages, and the supplier selection typically becomes a hard computational problem. We suggest a bidding langu...