This ad's argument, put in economic terms, is that the man's awareness of the "sunk costs" of the diamonds he's bought for the woman will exponentially increase his commitment to having sex with her alone -- since, having already spent so much money in order to have sex with his current partner, the prospect of going out and spending a whole bunch more on diamonds for a new parter seems too expensive."Hearts On Fire?" More like "Hearts Incinerated."
Of course, economic theory argues that it is always a mistake to take sunk costs into account when making decisions about future investments.

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