What are the two ethical justifications for the economic model of corporate social responsibility?

What are the two ethical justifications for the economic model of corporate social responsibility? What are the most significant challenges facing these justifications?
Changing a corporate culture is very difficult. Imagine that you are asked after their recent scandals to help move a firm like VW or Wells Fargo toward a more ethical culture. How would you begin to set the stage for this transition? What reasons would you use to support the change? How would you change attitudes and values?
Provide evidence or support for your answers. Cite and reference accordingly.

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