RDP 9204: The Term Structure of Interest Rates, Real Activity and inflation Equation (1)

\begin{array}{l} I = \frac{C}{V} + \frac{\dot{V}}{V} \\ \begin{array}{l} = R - \frac{\dot{R}}{R} & \Rightarrow & \dot{R} \end{array} = R (R - I) \end{array}