There are also some rather exotic types of assets available as ETFs but not as open - ended funds. (badmoneyadvice.com)
However, the ETFs which have low liquidity tend to be the more exotic type, the type conservative individual investors tend to avoid. (getrichslowly.org)
Some will say that rating agencies must say «no» to Wall Street when asked to rate exotic types of debt instruments that lack historically relevant performance data. (alephblog.com)