Units:1 Additional depth of content for ECON 423. Students receive single grade for combined four units of ECON 423 and ECON 423D. Division: Upper Division Requisites: Pre-requisite: ECON 210. Co-requisite: ECON 423. Permission to enroll: No Special Consent Required Grading mode: Optional Grade Basis Sustainability: Sustainability Focused Weekly: Seminar 1 hr.