That is because the whole messy business involves elements of behavioural psychology as well as the laws of mechanics, control theory and fluid dynamics.

因为该理论牵涉的领域庞杂，包括行为心理学、机械学，控制理论学和液体动力学。

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As described here previously, control of the three primary elements of the business relationship has shifted as the Age of the Seller is being replaced by the Age of the Customer.

FORBES: 7 New Rules For Prospecting In The Age Of The Customer

For millennia, there have been four basic elements of the relationship between a customer and a business: The product, the buying decision, control of information and word-of-mouth.

FORBES: The Age Of The Customer Is The New Normal