Demand
Overview
Demand (수요, Demand) is a concept in economics that combines consumers' willingness and ability to purchase a specific good or service over a given period. Unlike simple needs or wants, demand must be backed by purchasing power, and it serves as a core mechanism for price determination and resource allocation in a market economy. Changes in demand directly affect firms' production plans, government economic policies, and overall economic growth.
Main Content
Law of Demand
The Law of Demand describes the relationship where, all else being equal, as the price of a good rises, the quantity demanded decreases, and as the price falls, the quantity demanded increases. This inverse relationship between price and quantity demanded holds for most goods. For example, if the price of a smartphone drops from 1 million won to 800,000 won, consumers tend to purchase more smartphones. This law is explained by the income effect and the substitution effect. The income effect refers to the phenomenon where a price decrease increases real income, thereby boosting purchasing power, while the substitution effect occurs when a relatively cheaper good replaces other goods.
Demand Curve and Demand Function
The Demand Curve is a graphical representation of the relationship between price and quantity demanded, typically sloping downward to the right. The Demand Function mathematically expresses the various variables affecting quantity demanded (price, income, tastes, prices of related goods, etc.). A basic demand function can be expressed as Qd = f(P, Y, T, Pr, ...), where Qd is quantity demanded, P is the price of the good, Y is income, T is consumer tastes, and Pr is the price of related goods.
Price Elasticity of Demand
Price Elasticity of Demand measures the responsiveness of quantity demanded to changes in price. It is calculated as the percentage change in quantity demanded divided by the percentage change in price. If the absolute value is greater than 1, demand is elastic; if less than 1, it is inelastic; and if equal to 1, it is unit elastic. For example, necessities (salt, rice) exhibit inelastic demand, while luxury goods (designer handbags, high-end cars) show elastic demand. Elasticity provides important insights for firms' pricing strategies and government tax policies.
Factors Affecting Demand
Demand changes due to various factors. First, changes in income: as income increases, demand for normal goods rises, while demand for inferior goods falls. Second, consumer tastes and preferences: trends, advertising, and cultural changes influence demand. Third, prices of related goods: an increase in the price of substitutes raises demand for the good, while an increase in the price of complements lowers demand. Fourth, population structure and expectations: population growth or expectations about future prices also alter demand.
Individual Demand and Market Demand
Individual Demand refers to the demand of a single consumer, while Market Demand is the sum of all consumers' individual demands. The market demand curve is derived by horizontally summing individual demand curves. Market demand serves as fundamental data for firms' production decisions and government regulatory policy formulation.
Recent Trends
As of 2024-2025, the concept of demand is evolving in conjunction with the digital economy and sustainability issues. First, the surge in demand for digital goods and services has partially modified traditional demand laws. For instance, in cloud services or the subscription economy, marginal costs are near zero, and price declines may not always lead to increased demand. Second, the spread of ESG (Environmental, Social, Governance) management has increased demand for eco-friendly products, causing significant changes in firms' production methods and marketing strategies. Third, advances in artificial intelligence (AI) and big data analytics enable firms to predict consumer demand in real time and offer customized products. Fourth, global supply chain instability and inflation have heightened consumers' price sensitivity, leading to increased demand for discount stores and second-hand trading platforms. Finally, the growth of the metaverse and virtual economy has elevated demand for virtual goods as a new economic domain.
Related Topics
- [[Supply]]
- [[Market Equilibrium]]
- [[Price Elasticity]]
- [[Consumer Theory]]
- [[Demand Forecasting]]
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