One of Warren Buffett's favorite ETF attracts $100B for first time

1. VOO surpassed $100 billion in net cash flow this year. 2. Vanguard's unique ownership structure appeals to long-term investors. 3. S&P 500 Index advanced 27% this year, boosting VOO's attractiveness. 4. Buffett favors VOO for long-term investment compared to SPY. 5. VOO has $588 billion in assets with a low expense ratio.