A forest investment firm is considering acquiring a large forest tract suitable for growing long- lived hardwoods like mahogany. They project a long rotation age (around 100 years) and want to determine the optimal rotation that maximizes the Net Present Value (NPV) of the investment. Explain the key differences between calculating LEV and NPV for forest rotations. Identify additional information required to calculate the optimal rotation using NPV for this scenario (compared to LEV calculations).