Marktgrenzen

Marktgrenzen, or market boundaries, are the conceptual limits used to define the scope of a market in economic analysis and competition policy. They identify which products or services belong to the same product market and which geographic area constitutes the same market in which firms compete. Correctly defined market boundaries are essential for assessing market power, evaluating mergers, and guiding regulation.

Product market boundaries are determined mainly by substitutability: whether consumers view two products as alternatives. Geographic market boundaries are determined by the area where buyers can reasonably obtain substitutes at similar prices and with comparable terms. Together, these boundaries determine who competes with whom, how prices are set, and the level of competition.

Analysts typically determine market boundaries using a mix of methods. The hypothetical monopolist test (SSNIP) asks whether a small, non-transitory price increase would lead buyers to switch to substitutes. Other approaches include cross-price elasticity analysis, demand- and supply-side substitution, and consideration of consumer perception and regulatory constraints. Data on sales, prices, and accessibility also inform the boundaries.

Boundaries vary by product, industry, and context. Local markets for everyday goods are often geographically bounded, while online platforms and digital services can widen or erase traditional geographic limits. In energy, telecom, and some retail sectors, boundaries may be national or cross-border.

Limitations exist because markets are dynamic; new substitutes, platforms, or regulatory changes can shift boundaries. Consequently, analysts may present multiple market definitions to test the robustness of their conclusions.