BlackRock last week cut management fees on some of its iShares exchange-traded funds to as low as 0.04%, or $4 on a $10,000 investment. Charles Schwab quickly followed suit, and then Cambria Investment Management's Cambria Global Asset Allocation ETF assessed a management fee of zero. At least two ETFs in Europe have total expenses of zero, according to research firm ETFGI. Read the original story from The Wall Street Journal.