This book intends to help small business owners. Many business owners, such as Medical Doctors, suddenly find out they are in business and they are making a lot of money. But they have never received any education in microeconomics. This book teaches quickly how to do Economic Evaluations suitable for correct business decisions. It is a misconception that Accounting is a good tool for business decision making. It is not. Accounting, mixed with a few Economic ideas, is catastrophic. Sorry Accountants! A correct Economic Evaluation depends less in the correct use of Algorithms that in digging out accurate data for the analysis. Normally, about 85 percent of the effort goes to obtaining accurate data to input in the variables of the Algorithm. Bernard Antonio Maristany y Costales-González was born in Havana, Cuba, in 1931. His primary and secondary education were studied at The Colegio de la Salle, Vedado, in Havana. He graduated in both tracks, Science and Letters, simultaneously. He graduated in 1949. He earned a Bachelor in the Science of Chemical Engineering at Rensselaer Polytechnic Institute (RPI) in Troy, New York, in 1953. He returned to Cuba to work in Soap and detergents (Crusellas & Co.) in paint manufacture (Sherwin Williams), and also taught Metallurgy and Unit Operations laboratory to seniors in Chemical Engineering at the University of Saint Thomas Of Villanova, in Havana. He moved with his family to Miami, Florida in 1960. Later he earned an MBA from the University of Delaware in 1965. He moved to Wilmington, Delaware in 1962. He worked with then Atlas Chemical Industries in their Corporate Economics Department. He moved in 1965 to Baton Rouge, LA to work in Economics with Ethyl Corporation.