AQA A Level Microeconomics Notes: Methodology, Market Prices, Costs, Revenues PDF

Page 2: Demand and Price Elasticity

This page delves into the concepts of demand and price elasticity, crucial components of microeconomic theory. It provides a comprehensive explanation of demand, factors affecting demand, and the law of demand.

The page begins by defining demand as the quantity of goods or services that consumers are able and willing to buy at a given price during a specific period. It emphasizes the inverse relationship between price and quantity demanded, known as the law of demand.

Definition: The law of demand states that there's an inverse relationship between price and quantity demanded, ceteris paribus (all other factors remaining constant).

Factors affecting demand are listed, including population, income, related goods, advertising, tastes/fashion, expectations, and seasons. The page explains how changes in these factors can cause shifts in the demand curve.

Highlight: Movements along the demand curve are caused by changes in price, while shifts of the entire curve are caused by changes in other factors affecting demand.

The concept of price elasticity of demand (PED) is introduced, defined as the responsiveness of change in quantity demanded to a change in price. The page provides a formula for calculating PED and explains different types of elasticity:

1. Price inelastic goods $PED < -1$
2. Price elastic goods $PED > -1$
3. Perfectly inelastic goods $PED = 0$
4. Unitary elastic goods $PED = -1$
5. Perfectly elastic goods $PED = ∞$

Example: Air and water are given as examples of inelastic goods because they have no substitutes.

Factors influencing PED are discussed, including the number of substitutes, percentage of income spent, whether the good is a luxury or necessity, addictive or habitual consumption, and time period.

Vocabulary: A Giffen good is defined as a low-income, inferior good where demand increases as price increases.

Page 3: Income Elasticity, Cross Elasticity, and Supply

This page covers income elasticity of demand (YED), cross elasticity of demand (XED), and the concept of supply in microeconomics. These concepts are crucial for understanding market dynamics and consumer behavior.

The page begins by defining income elasticity of demand (YED) as the responsiveness of demand to changes in consumer income. It explains how YED can be used to classify goods:

• Normal goods: YED > 0
• Luxury goods: YED > 1
• Inferior goods: YED < 0

Example: Television sets are given as an example of a luxury good with YED > 1.

Cross elasticity of demand (XED) is introduced as the responsiveness of demand for one product to changes in the price of another product. The page explains how XED can be used to identify relationships between goods:

• Substitutes: Positive XED
• Complements: Negative XED
• Unrelated goods: XED = 0

Highlight: The strength of the relationship between goods can be determined by the magnitude of XED.

The concept of supply is defined as the quantity of goods or services that a firm is able and willing to supply at a given price during a specific period. The law of supply, which states that price and quantity supplied are in a direct relationship, is explained.

Definition: The law of supply states that there is a direct relationship between price and quantity supplied.

Factors causing shifts in supply are listed, including productivity, technology, indirect taxes, subsidies, number of firms, weather, and costs of production. The page emphasizes that changes in price cause movements along the supply curve, while changes in other factors cause shifts of the entire curve.

Vocabulary: Profit incentive is highlighted as a key factor in the upward slope of the supply curve.

Page 4: Price Elasticity of Supply

This final page focuses on the concept of price elasticity of supply (PES), an important aspect of microeconomic analysis. It provides a brief overview of PES and its implications for market dynamics.

The page defines price elasticity of supply (PES) as the responsiveness of quantity supplied to a change in price. It provides the formula for calculating PES:

PES = % Change in Quantity Supplied / % Change in Price

Definition: Price elasticity of supply (PES) measures how responsive the quantity supplied is to a change in price.

The page notes that PES is always likely to be positive, reflecting the direct relationship between price and quantity supplied as described by the law of supply.

Highlight: Unlike price elasticity of demand, which is typically negative, price elasticity of supply is usually positive due to the profit incentive for firms.

The concept of perfectly inelastic supply is briefly mentioned, where PES = 0. This represents a situation where supply remains constant regardless of price changes.

Example: While not explicitly stated in the text, an example of a good with perfectly inelastic supply in the short run might be tickets to a sold-out concert, where the quantity cannot be increased regardless of price increases.

Although the page is brief, it provides a foundation for understanding how supply responds to price changes, which is crucial for analyzing market behavior and predicting outcomes in various economic scenarios.

Page 1: Economic Methodology and Scarcity

This page introduces fundamental concepts in economic methodology and the economic problem of scarcity. It covers positive and normative statements, needs versus wants, and the basic economic problem.

The page begins by distinguishing between positive and normative statements in economics. Positive statements are objective and based on facts, while normative statements are subjective and based on value judgments.

Definition: Positive statements are objective and can be tested, while normative statements are based on opinions and value judgments.

The concept of scarcity is introduced as the fundamental economic problem. Resources are limited, but human wants are unlimited, necessitating choices in resource allocation.

Highlight: The basic economic problem is defined as unlimited wants but limited resources, requiring efficient resource allocation.

The page also covers the factors of production (land, labor, capital, and enterprise) and their respective rewards (rent, wages, interest, and profit). It explains how different economic systems (planned, mixed, and market economies) address the basic economic questions of what to produce, how to produce, and for whom to produce.

Example: North Korea is given as an example of a planned economy where the government controls economic decisions.

The Production Possibility Frontier (PPF) is introduced as a tool to illustrate scarcity, efficiency, opportunity cost, and gains from trade. The PPF shows the maximum potential output of an economy using two goods or services when all resources are fully and efficiently employed.

Vocabulary: Opportunity cost is defined as the cost of the next best alternative forgone when a choice is made.