One of the clues to glean from tight credit spreads could augur well for ETFs like NBFC: low default rate expectations. That's undoubtedly a good sign when it comes to investing in corporate debt. It's also material in discussing NBFC, because the ETF devotes some of its roster to non-investment grade bonds. "Meanwhile, corporate bond yields have been sending signals of their own — about interest rates, yes, but also about where the economy is headed,†reported Marketplace.org. "Corporate bonds are generally ...