This week on The NAVigator, Jeremy Goff, managing director at Tortoise Advisors, discusses how investors can use interval funds -- which have less liquidity than the standard closed-end fund -- to add structure and diversification to a portfolio. Goff compares traditional closed-end funds, as well as hedge funds, to interval offerings, noting that the reduced liquidity of an interval fund often pays off by allowing managers to pursue higher-risk strategies without any danger of investor flight