Vernon used product life cycle explain foreign trade and investment but didn't give the inside reasons.
弗农只是用产品周期理论来解释国际贸易和投资的流向，却没有深入到其背后的原因。
A real options approach was applied to analyze optimal investment decision. A model that incorporated the product life cycle as well as market structure was introduced.
应用实物期权方法探讨投资决策问题，提出了一种同时考虑产品生命周期和市场结构的分析模型。
However, it is inevitable that the implementation of ERP projects is complex and high-risk because the investment of project is large and life cycle of the implementation is long.
但是，企业ERP项目的实施投入巨大、实施周期长，实施过程复杂，因此ERP项目的高风险性也就在所难免。
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