This textbook is based upon a philosophical method of logical deduction from basic principles such as scarcity, individual choice and subjectivism.  This textbook attempts to show that all complex phenomena of economic theory such as prices of consumer goods and factors of production, saving and consumption, interest and profit, can be explained by the same primitive psychological principles of scarcity and substitution on the margin that could be used to describe economizing Robinson Crusoe on a desert island or two cavemen catching fish or exchanging apples for oranges. This...