Please sign up for the course before starting the lesson. YHWH HAMASCHIAC School, Spring Term SS2 Economics, Lesson 3. Theory of Cost and Revenue. #IGCSCE Introduction. YHWH HAMASCHIAC School, SS2 Spring/third Term Economics Continuous Assessment Test Back to: YHWH HAMASCHIAC School, SS2 Christmas, Easter Term & Spring Term Economics 2020/2021.