You both started talking about attribution and closing from an advertising lens LOL. I was looking for just an answer of "Sold from Leads" or "Sold in Timeframe" within the Retail scenario in the post. If the Poll was working, I would have been able to force the simple answer . Looks like you're team "Sold in Timeframe" (within the Retail scenario) from your answer. Thanks @Alex Snyder. Only love coming your way.I did not use my vendor brain to answer you. This is how I did it at Checkered Flag and how I do it to measure our own advertising at FRIKINtech.
But you're now asking about salespeople.
Other than attribution, I don't think there is a difference in measuring. I would measure a salesperson's close rate based on how many NEW customers (leads/opportunities) they worked vs. how many deals they sold in that calendar month.
@Rob stated it simply.