RESPONSES TO RISK IN WEED CONTROL DECISIONS UNDER EXPECTED PROFIT MAXIMISATION: COMMENT
评论指出Pannell关于风险降低最优除草剂使用率并提高杂草控制经济阈值的结论仅适用于凸产量函数；对于S形函数（如逻辑函数），在函数凹区间风险效应相反。
Pannell's finding that risk reduces the optimal rate of herbicide use and raises the economic threshold for weed control is found to depend upon the form of the yield function. Pannell's results apply only to convex yield functions. For sigmoidal functions, such as the logistic, risk has the opposite effect over the concave portion of the function's range.