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Mack variables
 U: ultimate claims
 R: reserve
 C: claims paid
 p_{i}: % rpt = 1 / CDF_{ult}
 q_{i}: % unrpt = 1  1 / CDF_{ult}

BF, CL & Benktander in Mack's notation
 U_{BF} = C_{k} + q_{k}U_{0}
 U_{CL} = q_{k}*(C_{k}/p_{k})
 U_{GB} = C_{k} + q_{k}U_{BF}

Mack's theorem 1
Further iteration of BF and GB for an arbitrary starting point U_{0} finally leads to CL

MSE of Benktander method
 Almost as small as that of the optimal credibility reserve
 Smaller than for BF

