2024-06-10-美联储-财经系列讨论（英）_61页_683kb

Summary of "Are Supply Networks Efficiently Resilient?"

Introduction and Motivation

• Supply networks often exhibit fragility, as seen in disruptions like those during the COVID-19 pandemic.
• The study addresses whether markets efficiently allocate resources to build resilience against supply shocks.
• Existing research on supply chain resilience shows the importance of capacity investment and market mechanisms in mitigating disruptions.

Key Findings

• Inefficiency and Insufficiency: Supply networks are suboptimal in resilience due to market failures.
• Root Causes: This inefficiency stems from market power and market incompleteness in the decentralized supply network.
• Behavioral Consequences: Upstream firms underinvest in production capacity, passing on costs to downstream firms by shifting to spot markets.
• Wedge Between Markets and Optimum: The decentralized market solution (K*) underinvests capacity compared to the constrained optimal benchmark (KSP), leading to unavoidable vulnerabilities despite the absence of large, rare shocks.

Model Overview

• The model features a two-tier economy: upstream intermediate goods firms and downstream final goods firms linked by supply networks.
• Key frictions include uncertainty, limited risk-sharing instruments, and imperfect substitutability of inputs.
• Firms take ex-ante capacity investments and hinge decisions on spot and pre-order markets, with market power amplified in spot market transactions.

Policy Insights

• Direct Interventions: Subsidies for capacity investments can offset private costs, stimulating optimal resilience.
• Market Reforms: Policies encouraging pre-order or forward markets can provide better risk-sharing.
• Structural Reforms: Enhancing competition, substitutability, scalability, and diversification increases network resilience and aligns market outcomes closer to the social optimum.

Conclusion

• Markets fail to deliver efficient resilience due to externalities in investment behaviors, reliance on spot markets, and incomplete contracts.
• Policies aiming at capacity incentives, robust market mechanisms, and competition reforms are indispensable to strengthen supply networks against inevitable disruptions.