I'm a senior leader at Amazon and have seen many bad managers. Here are 3 reasons why there are so few great ones.

• Brandon Southern is a senior leader at Amazon and former head of analytics at eBay and GameStop.
• He writes that very few managers actually have a strong desire to elevate others. 
• Southern also writes that managers often sacrifice employee growth to meet deliverables.  

I've seen a couple of good leaders, and a lot of bad managers throughout my 20-year career in tech and as a head of analytics at companies including eBay, Amazon, and GameStop.

I spent time reflecting on why so many managers fall into the category of a bad manager, instead of into the category of a great leader.

There are three main reasons why this occurs.