Affiliate tracking cookies

[NewWisdom]

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Hi There,

I'm going to start this question off in a technical thread although not sure if it is more suited to a general affiliate marketing topic...

Should affiliate tracking cookies from a website overwrite ealier cookies from a different website or should the earliest website to have caused the customer to click be credited with the sale? What is the industry standard on this?

Many Thanks

[pistol101]

Last click is the industry norm.