The classic textbook "Principles of Economics" was written by Alfred Marshall and first published in 1890. This work is considered one of the foundational texts of modern economics, bridging classical economics and the emerging field of neoclassical economics.
Marshall introduced key concepts like supply and demand, elasticity, and the marginal utility theory into a coherent framework, emphasizing their role in determining prices and distribution. While focusing on economic principles, the book retains a strong connection to political economy, reflecting Marshall's belief in the social implications of economic policies and the need to address issues like poverty and inequality.
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Elasticity in economics measures how responsive one variable is to changes in another. The most common form, price elasticity of demand, gauges how much the quantity demanded of a good changes in response to a price change. If demand changes significantly with price, it’s considered elastic; if it changes little, it’s inelastic. Elasticity can also apply to supply, income, and cross-price effects between goods. It's calculated as the percentage change in one variable divided by the percentage change in another. Elasticity helps businesses set prices, policymakers predict tax impacts, and economists analyze market behavior and consumer sensitivity to changes.
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Marginal utility theory explains how individuals make decisions based on the additional satisfaction (utility) they gain from consuming one more unit of a good or service. Proposed by economists like William Stanley Jevons, Carl Menger, and Léon Walras, the theory states that utility diminishes as consumption increases, known as diminishing marginal utility. For example, the first slice of pizza provides more satisfaction than the fifth. Consumers allocate resources to maximize total utility, balancing marginal utility with cost. This principle underpins demand curves in economics, as higher quantities are only consumed when prices are lower, reflecting declining additional satisfaction.
