Grow Your Business Through Superior Customer Experiences by D. Randall Brandt and Rodger Stotz:

Managing organizations is a complex endeavor. Employee satisfaction is one factor in an interdependent system that a manager must consider. The challenge is managing the interactions. Most decisions will impact many different facets of the organization. How you weigh the competing desires for profit, pleasing customers, providing good jobs for employees, etc. is what management is about.

This is not a zero-sum game. Good managers grow the pie so all the stakeholders can get more benefit (customers, investors, employees…).