Presents introductory concepts pertaining to choices of individual economic decision-makers. Topics include scarcity, specialization and trade, market equilibrium, consumer demand, elasticity, production and cost theory, market structures, factor markets, market failure, and international trade. Credit for one course allowed between ECON 201B and ECON 201AG. Prerequisite: MATH 123. Advisory: MATH 127. Transfer: CSU; UC (For UC, maximum credit of 3 units total between ECON 201AG and ECON 201B).