(1) Introduction to Demand Functions
Demand Function, Demand Curve, Economics of Demand, Demand for Goods and Services
This introduces the notion of demand. It explains "effective" demand and presents the concept of a demand function.
Crane, Steven E., "(1) Introduction to Demand Functions" (2010). Principles of Microeconomics. Paper 7.
Ability to distinguish notional vs. effective demand. Ability to identify three key issues examined by demand analysis.