[Lectures] [1a] [1b] [1c] [1d] [What is Economics] [Using Theories] [Why?] [Scarcity and Choice] [Maximizing Satisfaction] [Resources] [Models/Graphs] [Prod. Eff.] [Alloc. Eff.] [Equity] [Full Employment] [scarcity] [mustchoose] [3options] [5Es] [Res. Quiz] [Motorola] [full employment] [Calculator] [Goal Quiz] [5 Es Review Quiz]