March started in one place (high) and ended in another (low). Amid the carnage, traders and investors leaned on ETFs, which saw record volumes. On this episode of Trillions, Eric and Joel speak with Bloomberg Intelligence ETF analyst Athanasios Psarofagis about who the winners and losers in the selloff were, who benefits most from the Fed's rescue plan and how the stage is set for smart-beta to have its next "immaculate rebalance."