Before revision:  To investigate how this paradox can be overcome, we argue that  future electricity prices can be accurately modeled from the residual load obtained by subtracting the sum of inflexible productions from the load.
After revision:  To investigate how this paradox can be overcome, we argue that , under certain assumptions, future electricity prices can be accurately modeled from the residual load obtained by subtracting the sum of inflexible productions from the load.