Economic outlook for businesses in general and for this particular industry. The degree of control of the business represented by the interest to be valued. The value of stocks in the same or similar line of business that are publicly traded. Consideration for the size of any prior sale of this business' stock. For estate planning purposes, when the value of a business has not been fixed, it is left open to be a negotiating point with the Internal Revenue Service.
Business valuations provide the answers.
Finally, for the purpose of retirement, disability, and death, business owners should have an agreed upon formula to be used to determine the value of the interests of the business.