This includes quota-share, surplus, and combinations of
quota-share and surplus. For illustrative purposes, we also include the actual insurer's reinsurance coverage (which is generally a combination of all reinsurance arrangements and no reinsurance) and the case of no re-insurance.
We use actual retention ratios αij and Rij and so allow these
levels to vary among and within every group (see Appendix B).
The objective is to keep the original amount of retained risk fixed for each
group (e.g., ∑njr i¼1 SI−SIRr ) while assessing different reinsurance
arrangements with combinations of different αij and Rij