An entrepreneur quits a job where she was earning $60,000 per year and starts her own business.

Question:

An entrepreneur quits a job where she was earning $60,000 per year and starts her own business. In this business she is earning $20,000. What is the cost of the business? Suppose the entrepreneur is so happy being on her own that she thinks it gives her the same joy that a $100,000 job would. What is the cost of the business?