Baumol–Tobin model

The Esscher principle is a insurance premium principle. It is given by $\pi [X,h]=E[Xe^{hX}]/E[e^{hX}]$, where $h$ is a strictly positive parameter. This premium is in fact the net premium for a risk $Y=Xe^{hX}/m_{X}(h)$, where $m_{X}(h)$ denotes the moment generating function.

The Esscher principle is a Risk measure used in actuarial sciences that derives from Esscher transform. This risk measure doesn't respect the positive homogeneity propertie of Coherent risk measure for $h>0$.