The Impact of Implicit Government Guarantee on Credit Rating of Municipal Investment Bonds

Paper: arXiv 2409.13957

Authors: Yan Zhang, Yixiang Tian, Lin Chen

Abstract

One type of bond with the most implicit government guarantee is municipal investment bonds. In recent years, there have been an increasing number of downgrades in the credit ratings of municipal bonds, which has led some people to question whether the implicit government guarantee may affect the objectivity of the bond ratings? This paper uses text mining methods to mine relevant policy documents related to municipal investment bond issuance, and calculates the implicit guarantee strength of municipal investment bonds based on the PMC index model. It further analyzes the impact of the implicit guarantee strength of municipal bonds on their credit evaluation. The study found that the implicit government guarantee on municipal investment bonds does indeed help to raise the credit ratings assigned by credit rating agencies. The study found that, moreover, the government’s implicit guarantee has a more pronounced effect in boosting credit ratings in less developed western regions.

Complexity vs Empirical Score

• Math Complexity: 3.5/10
• Empirical Rigor: 5.5/10
• Quadrant: Street Traders — practical and empirical, lighter on theory

Why this score: The paper applies standard text mining and a panel ordered Logit model to study implicit government guarantees on Chinese municipal investment bonds. While the mathematical formulations are standard textbook models, the empirical combination of the PMC Index with policy text mining offers solid practical insights into regional credit rating drivers.

Research Flowchart

  flowchart TD
    A[Research Goal: Assess Implicit Government Guarantee Impact on Municipal Bond Ratings] --> B[Data Input: Policy Documents Related to Bond Issuance]
    B --> C[Methodology: Text Mining]
    C --> D[Model: PMC Index Model to Calculate Guarantee Strength]
    D --> E[Analysis: Impact of Guarantee Strength on Credit Evaluation]
    E --> F[Finding 1: Implicit Guarantees Boost Bond Credit Ratings]
    E --> G[Finding 2: Boosting Effect is More Pronounced in Less Developed Western Regions]

Cited References (11)

1. Evolution of Local Government Financing Platform Debt Risks - Measuring Expectations of “Implicit Guarantee” (2021)
2. Can Implicit Government Guarantees Effectively Lower the Credit Spread of Municipal Bonds? - Based on the Regression Results of Bonds with Different Ratings (2020)
3. The Impact of Local Debt Financing on the Effectiveness of Government Investment: A Study (2018)
4. Government Guarantee Intervention, Stabilization Growth Constraints, and the Expansion Trap of Local Government Debt (2018)
5. The Impact of the New Policy on Managing Local Government Debt on the Credit Risk of municipal Investment Bonds (2017)
6. Is the Guarantee of Urban Infrastructure Bonds Trustworthy? Evidence from Bond Ratings and Issue Pricing (2016)
7. Government Implicit Guarantee Risk Pricing: An Exploration Based on China’s Bond Trading Market (2016)
8. Government Implicit Guarantee, Debt Default and Interest Rate Determination (2015)

0 of 11 cited works are in the corpus; resolved via arXiv source bundles, Semantic Scholar and OpenAlex. Corpus-wide: 2518 linked papers.