产品绿色认证模型的扩展研究

对Vertinsky的绿色认证模型的假设条件进行了扩充．假设有形质量的生产成本与产品的无形质量（环境友好性）表现为负相关关系．由此得出结论，如果两厂商可自由选择产品的环境质量认证水平，则总质量高的产品的环境质量水平也高．如果两厂商必须通过政府规定的环境质量认证，则产品总质量高的厂商选择通过高质量的环境认证，而产品总质量低的厂商选择通过低质量的环境认证．与帕累托最优时相比，厂商自由选择环境认证水平时产品的环境质量相对低下．但在两个厂商都通过认证的前提下，不能确定单一水平认证和两个水平认证究竞谁更优．

Extension research on green certification model of product

The hypothesis conditions of green certification model of Vertinsky are extended: assume the production cost of observable quality is negatively correlated to unobservable quality level(environmental friendliness).Main conclusion is,if two firms can freely choose quality level of certification,the firm with high total-quality product should choose to supply high environmental quality;if both firms have to certify their products in terms of government rule,it is socially optimal to let the firm with high total-quality product obtain a high environmental quality certification,however it is uncertain whether one certification level or two different certification levels are socially optimal when both firms certify their products.