The document outlines concepts and topics related to economics that students should understand for the Cambridge IGCSE examinations in 2012. It covers definitions of key economic terms like scarcity, factors of production, opportunity cost, market equilibrium, demand and supply factors. It also discusses market allocation of resources, market failure, costs and revenues for firms, macroeconomic indicators, differences between developed and developing economies, and international trade. The document provides detailed syllabus statements and explanations to prepare students for exam questions.