I was wondering about this earlier and I'm stumped.
closed as off-topic by Chris W. Rea, Rupert Morrish, Dheer, JoeTaxpayer♦ Jul 12 at 2:06
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on economics are off-topic unless they relate directly to personal finance." – JoeTaxpayer
If interest rates are falling overall, this increases the general valuation of the stock and bond markets. If there is also some concern about economic weakness, and/or strong demand for Treasurys, this could increase corporate bond spreads because corporate yields may fall but not as much as Treasury yields.