Of an economic approach of the tourism, made by applications of the instruments of the economist for this new field of investigation, we are gradually spent in a research on a tourist economy based on the specificities of this last one : Its temporal dimension (saisonnality of the activities,...

First part: Finance is built on a three-dimension risk: risk is measured, assessed, aggregated. If the economics of the crisis encourage reform and relaunch, it is also the sign of a crisis of economics. Two lessons can be drawn: avoid absurd risk -a fourth and often forgotten dimension of risk-...