Culture is the Behavior You Reward and Punish (by Jocelyn Goldfein)

 Jocelyn Goldfein discusses how culture is actually the behavior that is rewarded and punished.  Some highlights:  

People stop taking values seriously when the public rewards (and consequences) don’t match up.
When role models are consistent, everyone gets the message, and they align towards that expectation even if it wasn’t a significant part of their values system before joining the company. That’s how culture gets reproduced, and how we assimilate new co-workers who don’t already possess our values.
It takes unanimity to establish a positive norm in your culture, but it only takes a little inconsistency to lose it.