NK stands for "No Kindness". It's a general corporate trickle-down philosophy for profitability.

The monkeys at the top of the tree eat the delicious ripe bananas, then drop banana peels and poo onto union employees (expired contracts), non-union employees (all outsourced at bottom wages and no benefits), and finally down onto the customers (who are shown No Kindness at all from the demotivated work force and made to feel that is what they deserve for what they paid.)

For some reason, everybody keeps fertilizing new banana trees with the discarded peels and poop, to grow more bananas for the monkeys at the top.