IMF-数字支付垄断下的银行竞争与家庭隐私（英）-2023.6-57页_713kb

Summary of "Bank Competition and Household Privacy in a Digital Payment Monopoly"

Key Points

1. Core Conflict: New digital payment technologies collect large amounts of consumer data, enabling better creditworthiness assessments. However, this raises trade-offs between privacy preservation and borrowing terms.

2. Market Dynamics:

   • The digital payment monopoly creates a payment choice dilemma for households: anonymous cash vs. intrusive digital payments that reveal credit quality.
   • Households with low privacy costs and high creditworthiness favor the digital payment, while privacy-conscious or low-quality borrowers prefer cash. This creates a "disclosure cascade," where increased intrusiveness leads to broader DC adoption.

3. Inefficiencies in Lending Markets:

   • The monopoly extracts monopoly rents by selling data access to banks, exploits information asymmetries, and slows the speed of convergence toward efficient credit markets.
   • Unrestricted data access can limit bank competition, leading to dead-weight loss in financial intermediation.

4. Regulatory Insights:

   • Optimal regulation depends on market conditions (good vs. bad states). Data regulation should balance privacy costs against the benefits of credit differentiation during crises.
   • Second policy instruments (taxes/subsidies on DC use) could complement regulation to improve welfare outcomes.

5. Policymaker Tradeoff:

   • In favorable states, privacy regulation is costly but necessary to prevent misuse. In adverse states, data-driven credit differentiation is crucial for access.
   • Extensive margin regulation vs. intensive (extent) data collection requires careful balancing via nuanced tools.

Conclusion: Data monopolies embed significant financial and privacy tradeoffs, requiring regulations that preserve stronger competition across both payments and credit markets.