'Absolute tsunami' of ETFs to hit market, and investors need to prepare now, says fund expert

  • Vanguard Group's S&P 500 ETF is already on pace to break the exchange-traded fund record for annual inflows, which it just set last year. Year-to-date, over $400 billion has flowed into ETFs amid the market volatility, from buy-on-the-dip U.S. stock bets to bond funds and hedges like buffered equity, as well as bitcoin and gold portfolios.