We analyse high-frequency data by means of the duration between successive ticks and volume of capital durations. It allows to introduce trading activity and coactivity measures, which may or may not also be volume weighted. Some applications on particular stocks of the PAris Bourse are provided.

The paper investigates the pricing of derivative securities with calendar-time maturities.

In this paper we show how the order of Linear Stochastic Dominance proposed by Gollier (1995) can be applied to situations with dependent risky assets.

We study a model of renegotiation between a borrower and lender in which there is the potential for moral hazard on each side of the relationship.