Interesting title huh? This is an article I found on Forbes and it does present a case for being very careful with Excel. Many, if not most, companies use Excel extensively, including Investment Banks. They also make mistakes. If they are copying/pasting data (they are) then it is very easy to make a mistake and the model will potentially help manager make faulty decisions that can lose millions maybe billions of dollars. Use VLOOKUP instead! 🙂