A flattening Treasury yield curve is part of the problem for mortgage-backed securities, says Harley Bassman.
Source: [MarketWatch](https://www.marketwatch.com/story/why-mortgage-bonds-are-set-to-deteriorate-and-possibly-hit-the-whole-market-according-to-this-wall-street-expert-0dd7f05d?mod=mw_rss_topstories)