(A) Net discounted value from the present to infinite time (relativized scale) at steady state vs. the proportion of phosphorus-intensive farms. Curves are shown for a deterministic analysis that ignores stochastic disturbances to P input, and a stochastic analysis that takes the expectation of the probability distribution of disturbances. (B) Size of the low-phosphorus attractor (Appendix 8) and standard deviation of the disturbance to P inputs vs. the proportion of P intensive farms, at steady state.