How insurers are modeling and pricing climate risk
Boomhower et al. investigate how homeowners insurance markets are responding to escalating climate risks, particularly focusing on wildfire risk in California. In particular, the authors explore the “winner’s curse,” where firms with less accurate pricing strategies face higher expected losses. This concept helps explain the observed variations in pricing across different insurers. The authors use
proprietary parcel-level wildfire risk data and insurance premiums derived from insurers’ regulatory filings. This data allows for a detailed analysis of how insurance is priced based on varying levels of wildfire risk.
Methodology:
- The paper begins with a descriptive analysis of California’s homeowners insurance market, noting trends in premiums, policy cancellations, and participation in alternative insurance programs like the California FAIR Plan.
- The authors develop a theoretical model of natural hazard insurance that incorporates price regulation and asymmetric information among insurers. They analyze how different insurers use varying degrees of granularity in their pricing strategies for wildfire risk.
Findings:
- Variation in pricing strategies: There is significant variation in how insurers price wildfire risk. Firms relying on less granular data tend to charge higher prices in high-risk segments or opt not to insure those properties at all. Insurers with better information about risks can offer more competitive prices.
- Regulatory constraints: The authors discuss how existing regulations may hinder insurers’ ability to set prices that reflect the true costs associated with climate risks. This can lead to market exits by insurers and reduced availability of coverage in high-risk areas.
- Market dynamics: The paper concludes that the interplay between asymmetric information and regulatory constraints exacerbates issues related to pricing and availability of homeowners insurance in the face of increasing climate risks.
Overall, the findings suggest that improving access to better risk information could enhance pricing accuracy and availability of insurance, which is crucial as climate change continues to intensify natural disaster risks.
How Are Insurance Markets Adapting to Climate Change? Risk Selection and Regulation in the Market for Homeowners Insurance
Authors: Judson Boomhower, Meredith Fowlie, Jacob Gellman, Andrew Plantinga
From: University of California at San Diego, University of California, Berkeley, University of Alaska Anchorage, University of California, Santa Barbara
Recent data how climate change fuels home insurance challenges in the U.S.
David Marlett has collected some recent data on how catastrophic climate events have impacted home insurance in the U.S.:
- Rising Costs and Premiums: The average home insurance premium increased by 33% from 2020 to 2023, reaching $2,530. This rise includes a 13% increase beyond inflation. Many large insurers have exited high-risk markets such as Florida and California, leading to decreased accessibility to insurance.
- Increased Non-Renewals: Between 2018 and 2023, over 1.9 million home insurance policies were not renewed, with non-renewal rates doubling since 2020 in areas most vulnerable to climate-related disasters. This has resulted in a growth of state-backed insurers of last resort.
- Impact of Climate Events: The home insurance industry faced $15.2 billion in losses in 2023, marking the worst year since 2000. The frequency of climate-related disasters costing over $1 billion has more than doubled from the previous decade, exacerbated by population migration to riskier areas and rising property values.
- Reinsurance Market Challenges: The reinsurance market, which provides insurance for insurance companies, has seen dramatic rate increases due to both climate-related losses and broader economic conditions. This instability affects insurers’ ability to manage risks effectively.
- Affordability Issues: Insurers struggle to raise premiums quickly enough to cover their costs due to regulatory approval processes. This has led some companies to withdraw from high-risk markets or reduce coverage options for consumers. A study indicated that the percentage of Americans without home insurance rose from 5% in 2019 to 12% by 2024.
- Economic Consequences: The lack of affordable home insurance poses risks not only for homeowners but also for lenders and the broader economy. Without adequate insurance coverage, recovery from catastrophic events becomes more difficult, potentially leading to increased defaults on loans and hindering economic growth.
The Perfect Storm in Home Insurance
By: David Marlett – Appalachian State University
