LAW6001 Chap.2 Digital Markets and Policy Instruments
Digital Markets and Policy Instruments
Mechanism before remedy
Platform concentration can arise from network effects, switching costs, data advantages and interactions between different sides of a market. The visible price may be zero while users pay through data, attention or reduced choice.
This chapter separates those mechanisms and asks which legal instrument reaches each one without destroying useful network value.
A falsifiable recommendation
Policy choice is treated as a causal claim. You identify the failure, explain how an obligation changes incentives, predict the behavioural response and state an indicator for review.
Original examples on learning platforms, social services and app stores show why broad remedies fail when they regulate a symptom rather than the loop producing dependence.
What this chapter covers
- 01
Direct and indirect network effects
- 02
Switching costs and lock-in
- 03
Two-sided market pricing
- 04
Zero-price consumer harm
- 05
Instrument and mechanism matching
- 06
Indicators, evasion and policy review
Worked example · free
Choose a remedy for a platform feedback loop
- 3Identify network effects and switching costs.
- 3Select a targeted instrument.
- 3State the indicator and evasion risk.
Key terms
- Network Effect
- An increase in user value caused by growth in the same or a connected participant group.
- Lock-In
- Dependence caused by data, habits, contracts or compatible services that make switching costly.
- Cross-Subsidy
- Pricing one participant group cheaply while recovering value from another group connected by the platform.
- Contestability
- The practical ability of rivals to enter and users or suppliers to switch.
- Self-Preferencing
- A platform's favourable treatment of its own services when it also controls access or ranking.
Digital Markets and Policy Instruments FAQ
Why can a free service still create competition harm?
A zero monetary price does not remove data extraction, attention costs, quality loss or dependence. Revenue may come from advertisers or business users. Analyse the side on which value is taken, the switching conditions and whether market power worsens privacy, access or ranking terms.
Does portability solve a network effect?
Portability can reduce the cost of leaving by moving data or history, but it may not recreate the community, suppliers or complements that make the incumbent useful. Interoperability, multi-homing or access measures may be needed when the principal barrier is the network rather than the stored asset.
How do I choose between a conduct and structural remedy?
Explain why the diagnosed mechanism can or cannot be reached by a narrower rule. Conduct duties may address ranking or access while preserving scale benefits. A structural remedy needs a stronger account of why monitoring, evasion or entrenched conflict makes the narrower approach inadequate.
What evidence connects a market theory to a remedy?
Build an evidence chain rather than jumping from size to intervention. Identify the user group and transaction at issue, the source of market power, the conduct that exploits or protects that power, and the measurable effect on access, price, quality, innovation or choice. Then state how the proposed instrument changes the mechanism.
Interoperability may reduce switching costs, data access may lower an entry barrier, a ranking duty may address self-preferencing, and separation may remove an entrenched conflict. Test the remedy against one benefit of scale and one route of evasion. This reveals whether the measure is proportionate and monitorable. Finish with an indicator, review date and response to non-compliance.
The resulting answer does not assume that every large platform causes the same harm; it explains why a particular control fits a particular mechanism and what evidence would show that the intervention is succeeding or needs revision.
Exam move
Draw the platform loop without labels, then add one factual indicator beside every arrow. Work an example twice: first as a competition problem and then as a privacy or consumer problem. The difference will show which actor, evidence and remedy each legal route can supply. Finish by writing a review clause that names success, evasion and a reason to withdraw the intervention.
Build three short case cards for network effect, lock-in and a two-sided market. Each card should contain a fact that proves the mechanism, a tempting fact that does not prove it and one intervention that would miss the mechanism. Change only one condition, such as easy multi-homing or portable history, and state how the analysis shifts.
Then compare transparency, non-discrimination and separation on common dimensions: conduct reached, evidence needed, monitoring burden, expected behavioural response and risk to useful integration. Avoid choosing the strongest-looking remedy before doing that comparison.
For the written assignment, turn the chosen mechanism into a causal paragraph: because this fact creates this barrier, this duty should change this incentive, and this indicator should reveal the result. For final revision, practise rejecting options that infer abuse from size or infer absence of harm from a zero price.
Say the decisive missing fact aloud, because naming it is faster and more reliable than rereading a definition.
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