Following the fire in the Mont Blanc tunnel, a new regulation was passed requiring each tunnel of a study of its specific risks and, for the transit of dangerous goods, a comparison with the risks alternative routes. In the practical implementation of these new studies, the temptation was great to multiply and more sophisticated modeling of fires, scenario analysis, the probability calculations, the criteria for making rational choices ... Group working to develop good practices, which had both an extensive field experience and scientific instruments, has gradually converged to a specific doctrine of "reasonable use" of science by their place in the traditional arguments based on simple rules, but tough. Be described by the complex trade-offs made ​​between two logics, the logic "hyperrationnelle" and the pragmatic logic, which are always more or less tension in the regulation of risk.

A growing number of investors no longer seeks mainly to earn money by running businesses, but by making transactions on property rights of companies. The purchase and resale of industrial and commercial establishments are moments where large sums of money are exchanged quickly and in which fortunes are made ​​and unmade. What are the consequences of these changes in ownership on the constant long-term development of the institutions concerned and prosperity (or decline) of their stakeholders (employees, customers, suppliers, small investors and local) ? We propose here to examine these issues from the case study of European investment in the Brazilian bioethanol.