Theory

Prices as Market Signals

In a market economy, prices function as essential messages that coordinate economic activity. A change in the price of a good or service communicates information about its relative scarcity and value. For example, a surge in the price of US cotton signals a need to find alternative suppliers and to innovate new technologies for processing them. Likewise, rising petrol prices encourage drivers to seek alternatives like trains, simultaneously signaling to rail operators a potential for profit in expanding their services. Similarly, an increase in electricity costs prompts firms and households to consider alternatives like installing rooftop solar panels.

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Updated 2026-05-02

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