ETF are an important innovation in financial markets, enabling to effectively invest in a broadly diversified portfolio of securities. Passively managed ETFs, offer average market returns, actively managed ETFs aiming for higher than average returns. Many studies show that actively managed funds are rarely able to exceed the average annual return of a given index over a period of more than one year, market inefficiencies allows to get a higher than average market returns. The major theoretical and practical problem is whether active funds can systematically exploit market inefficiencies. Santrauka Biržoje prekiaujami fondai (ETF) – svarbi finansų rinkų inovacija, suteikianti galimybę investuoti į plačiai diversifikuotą vertybinių popi...