PD estimates must be a long-run average of one-year default rates for borrowers in the grade, with the exception of retail exposures (see below). Requirements specific to PD estimation are provided in paragraphs CA-5.8.72 to CA-5.8.78. For retail asset class banks must estimate an appropriate LGD (as defined in paragraphs CA-5.8.79 to CA-5.8.83) for each of its retail pools and must also estimate an appropriate long- run default-weighted average EAD for each of its facilities as defined in paragraphs CA-5.8.84 and CA-5.8.85. Requirements specific to EAD estimation appear in paragraphs CA-5.8.84 to CA-5.8.89.