The document discusses the rule of thumb valuation method for small businesses. It is a quick valuation method that uses industry-based multiples of gross or net sales, or other financial indicators, to estimate a business's market value. While fast, it is not very accurate as it does not consider profits and can oversimplify valuations. The document provides examples of typical rule of thumb multiples used for different types of businesses and contact information for a business brokerage that can provide more details on formal business valuations.