Recognising that rates of return on various asset classes are not constant, do not accrue in a smooth manner through time, and vary according to prevailing value gaps should be incorporated into SAA.

This model is independent of the hypothesis of stock elementary value and effective market, and can explain the phenomenon of invalid market proposed by prevailing finance.

Hence this paper proposes a method in energy calculation, which can be arbitrary close to the exact value, and helps to measure the accuracy of the prevailing methods.