Analysis and Diversification of Municipal Investments
Now that you understand both general obligation (GO) bonds and revenue bonds, you can apply diversification principles to manage the unique risks each type carries.
Diversification Principles
Concentrating municipal holdings in a single issuer, region, or bond type increases credit risk and event risk. Proper diversification spreads across three dimensions:
| Dimension | Strategy | Why It Matters |
|---|---|---|
| Geographical diversification | Spread holdings across different states and regions | Reduces exposure to a single economy or tax base |
| Type diversification | Mix GO bonds, revenue bonds, and municipal fund securities | Balances different risk characteristics (taxing power vs. project revenue) |
| Rating diversification | Blend higher-rated (AAA/AA) and lower-rated (A/BBB) bonds | Balances safety and yield |
Investment implications:
- An investor holding only California municipal bonds faces concentrated geographic risk (earthquake, state budget crisis)
- An investor holding only revenue bonds from hospital facilities faces concentrated sector risk
- A blend of GO bonds, revenue bonds, and different geographies reduces the impact of any single event
Think of it this way: If a hurricane hits Florida, an investor who holds only Florida munis takes a concentrated loss. An investor spread across Florida, Texas, and New York absorbs the same event with far less portfolio damage.
Exam Tip: Gotchas
- Home-state tax benefit creates a diversification trade-off. Bonds from your home state are triple tax-free, but concentrating there adds geographic risk. The exam may test whether the tax benefit justifies the concentration.
- Rating diversification is not just about safety. Lower-rated bonds (A/BBB) offer higher yields, so the blend affects total return, not just credit protection.