Before revision:   A sub-class consists of pay-offs with fair values that are also free from numerical integration errors over option strikes , where exact pricing and hedging is possible via dynamic trading strategies on a few simple puts and calls.
After revision:  Their fair values are also independent of the monitoring partition. A sub-class consists of pay-offs with fair values that are also free from numerical integration errors over option strikes , where exact pricing and hedging is possible via dynamic trading strategies on a few simple puts and calls.