p=MV/Q ——-> f’ = df/dt

p’/p = (MV)’/MV – Q’/Q

S’/S= (1-u)σ(p) – δ= (1-u)σ(1)/p -δ —> *σ = output/capital ratio,  δ = constant = capital depreciation rate

Q’/Q = a’/a + L’/L = a’/a +v’/v+n’/n = α + β + v’/v,  v = %employment, α, β = constants

(MV)’/MV = p’/p + α + β + v’/v = p’/p + Q’/Q  —>  p’/p = (MV)’/MV – Q’/Q —>