Market Segmentation
Market segmentation is the division of a market into distinct groups of buyers with different characteristics, needs, or willingness to pay, and the design of products and pricing to serve each group. In economics, the concept is used to analyse price discrimination, the structure of markets, and the effects of segmentation on competition and welfare.
Bases for Segmentation
Segmentation can be based on observable characteristics, such as age, location, or income, or on unobservable characteristics, such as willingness to pay or preferences. Firms segment markets to tailor products, marketing, and prices to different groups, aiming to increase sales and profit.
The ability to segment depends on the ability to identify groups, to prevent arbitrage between them, and to serve them at reasonable cost. Where resale between groups is possible, differential pricing may be undermined by arbitrage.
Price Discrimination
Market segmentation underlies price discrimination, in which a firm charges different prices to different buyers for the same or similar products. First-degree discrimination charges each buyer their maximum willingness to pay; second-degree discrimination offers different prices for different quantities or versions; third-degree discrimination charges different prices to different groups.
Price discrimination can increase output and welfare in some circumstances, by allowing firms to serve customers who would not be served at a uniform price. In other circumstances it can reduce welfare, by allowing firms to extract more surplus from consumers. The welfare effects depend on the structure of demand and on the extent of market power.
Labour Market Segmentation
In labour economics, segmentation refers to the division of the labour market into distinct segments with limited mobility between them. The primary segment offers stable employment, good wages, and prospects; the secondary segment offers insecure, low-paid work with little advancement. Mobility between segments is limited, and workers in the secondary segment may be trapped there.
Segmented labour market theory challenges the view that the labour market is a single competitive market in which wages reflect productivity. It emphasises institutional factors, discrimination, and the structure of firms and industries in shaping employment outcomes.
Segmentation and Technology
Digital technologies have increased the scope for segmentation, by allowing firms to collect detailed data on consumers and to personalise prices and offers. This has raised concerns about privacy, about the fairness of personalised pricing, and about the effects on competition. The analysis of these issues combines economics, law, and ethics.
Segmentation also arises from network effects and platform structure, where distinct groups interact, as in two-sided markets. Pricing structures that balance the participation of different groups are central to the design of such markets.
Segmentation and Price Discrimination
Segmentation is the basis for price discrimination, which can take several forms. Third-degree discrimination charges different prices to identifiable groups, such as students and seniors. Second-degree discrimination offers a menu of options, with prices varying by quantity or quality, allowing customers to self-select. First-degree discrimination charges each customer their willingness to pay, which is difficult to implement in practice.
The welfare effects of price discrimination are ambiguous. It can increase output and serve customers who would otherwise be excluded, raising welfare. It can also transfer surplus from consumers to producers and, in some cases, reduce output. The assessment depends on the structure of demand and on the extent of market power.
Segmentation in Labour Markets
Labour market segmentation divides the market into segments with different characteristics and limited mobility between them. The primary segment offers stable, well-paid employment with prospects, while the secondary segment offers insecure, low-paid work. The two segments respond differently to economic conditions, with the secondary segment absorbing more of the adjustment to downturns.
The theory emphasises the role of institutions, including firms' internal labour markets, unions, and discrimination, in creating and maintaining segmentation. It challenges the view that wages are determined solely by productivity and that workers can move freely between jobs.
Digital Personalisation
Digital technologies have expanded the scope for segmentation, allowing firms to collect detailed data on consumers and to personalise prices and offers. This has raised concerns about fairness, privacy, and competition, and has prompted regulatory attention in several jurisdictions.
The analysis of personalised pricing combines economics, law, and ethics. From an economic perspective, personalisation can improve the matching of products to preferences and can increase output, but it can also enable firms to extract more surplus from consumers and to exploit behavioural biases. The design of regulation must weigh these effects and address concerns about transparency and consent.
Two-Sided Markets
Segmentation also arises in two-sided markets, where platforms serve distinct groups whose participation depends on each other. Pricing structures that charge one side more and the other less are common, reflecting the relative elasticities of demand and the strength of cross-group network effects.
The analysis of two-sided markets informs the assessment of competition and regulation in platform industries. Pricing below cost on one side, cross-subsidies, and exclusivity arrangements all involve segmentation and raise questions about their effects on competition and welfare.