Investors who have not purchased exchange-traded funds in their portfolios have avoided them, for the most part, because they “don’t know what they are,” according to Liz Skinner’s InvestmentNews article, “Investors Clueless about ETFs: Survey.” According to a survey of 2,000 adult investors conducted by Mintel Comperemedia, 64% of investors claimed ignorance about ETFs, and 15% of investors consider ETFs too complicated.