"[T]he retiree can always smooth her spending either by smoothing the spending budget or by spending more or less than the spending budget determined using the Actuarial Approach without smoothing. The key advantage of the Actuarial Approach over an approach such as the Safe Withdrawal Approach is that you always know how much you can spend to keep your current assets in balance with your current liabilities (the present value of future spending budgets based on reasonable assumptions and desired spending goals)."