"The lack of Wall Street dealers on standby to purchase, sell and even research corporate bonds after they’ve been issued means fund managers are increasingly left to their own devices when it comes to handling and trading their vast portfolios of the debt..."
"Said Hofer at Brown Brothers Harriman: “The real problem for daily redemption vehicles is if you’re surprised with a very large cash outflow you come up against a brick wall.”"
From:
http://www.bloomberg.com/news/articles/2015-12-14/bond-funds-are-on-their-own