Firms and Decisions Summary Notes 2023

Firms & Decisions – Summary Important: This set of summary notes does NOT replace the importance of the main set of notes in providing a clear understanding of the topic that is required in the A Levels. Check list – Key requirements. Part (1)  Understand the concept of profit as the difference between total revenue and total cost  Understand that firms make price and output decisions based on the marginalist principle  Sketch the various short run and long run curves and illustrate how changes on costs and revenue affect the various curves  Understand that firms have other possible objectives  Explain factors that affect the size of firms  Explain the different types of economies of scale [An understanding of the concepts of Average Revenue (AR), Marginal Revenue (MR), Average Total Cost (ATC) and Marginal Cost (MC) will be sufficient. Concepts on product curves and derivation of the cost curves are not required.] [An understanding that total cost incorporates a necessary minimum economic reward for firms to remain in the market is required.] [An understanding of the significance of variable costs and irrelevance of fixed costs in the pricing and output decisions of firms is required.]  Explain the key features of each of the market structures (PC, MPC, Oligopoly, Monopoly), and their respective demand curves  Explain how firms compete in the respective market structures based on their features  Understand the relevance of barriers to entry in explaining differences between market structures  Use the concept of profits to illustrate real world competitive behaviour of firms (in protecting their profits)  Apply these market structure models in analysing and comparing markets; and evaluate their usefulness as explanations of real world competitive behaviour Key information Part (1) Objectives of firms Profit-maximising objective Marginalist principle in determining profit maximising output and price Alternative objectives of firms Entry deterrence, revenue maximization, profit satisficing, and market share dominance Costs and revenue

Costs and revenue concepts* Distinction between short run and long run Average and marginal costs and revenue Internal and external economies and diseconomies of scale *Derivation of costs and revenue curves is not required. Firms’ decisions and strategies Characteristics of market structures* Considerations involved in firms’ decisions and strategies to achieve objectives including cost and revenue, competitors’ actions, business risks, uncertainty considerations* Decisions and strategies including price and output, price discrimination, shut -down decision, growth of firms, diversification, innovation, product differentiation, competition vs collusion* Impacts of decisions and strategies on consumers, firms and governments, including efficiency and equity, and consumer welfare. *Diagrammatic analysis of the comparison of types of