The default spread can be measured by:

The difference in yields between $10$ year corporate bonds and $10-$year T$-$Bonds w

The difference in yields between T$-$Aistes and T$-$Bills

The difference bectween casern rutiss and the yeted tormaturity

The difference between nominal and effective interest rates on bonds

The difference in yiclds hetween $29$ year $88-$pated muni bonds and $20-$year $BB$