What a formula in EXCEL– PRODUCT

I was in a huarry to convert a unit with one thousand in Excel 2003. I used the built-in formula PRODUCT like this =PRODUCT(A2,1000) and it seems fine with the conversion. But I was caught by the value of 1000 in the converted column by surprise. Any cell without a value (blank, NULL in database term0 will have 1000 in converted cell. What a result?! Instead, I have to use A2*1000 in the cell as function to do the conversion.
Lesson learned, do not assume anything. Double check your result before you turn it in.
By the way, it has the same behavior in Excel 2007.

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