“…In Uzawa (1974), it is proved that, for any time-path of utilities u (ut), where ut > 0, for all >_--0, the value of utility functional V= U(u) is uniquely determined. That is, V--U(u) is equal to the minimum value of initial condition U0 V for which the solution (Ut) to differential equation 1exists and is positive for all t, 0 _-< < +oo.…”