Money is pouring into the world's hottest investment product at nearly a record-setting pace (SPY, SPX)

Investing the UShas rarely been this popular, and exchange-traded funds have been the investment vehicle of choice. Traders poured $23.56 billion into US funds andETFs duringthe week ended Wednesday, less than $1.5 billion shy of the all-time record seen in March 2015, according to data compiled by a group of Bank of America Merrill Lynch analysts led by Yunyi Zhang. That marked a largestep up from the prior week, which saw inflows of $1.13 billion, the data show. Much of the weekly surgecame in...