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Most’s eclectic background also provided the spark behind the invention of what would become known as the ETF. During his travels around the Pacific, he had appreciated the efficiency of how traders would buy and sell warehouse receipts of commodities, rather than the more cumbersome physical vats of coconut oil, barrels of crude, or ingots of gold. This opened up a panoply of opportunities for creative financial engineers. “You store a commodity and you get a warehouse receipt and you can finance on that warehouse receipt. You can sell it, do a lot of things with it. Because you don’t want to be moving the merchandise back and forth all the time, so you keep it in place and you simply transfer the warehouse receipt,” he later recalled.19 Most’s ingenious idea was to, after a fashion, mimic this basic structure. The Amex could create a kind of legal warehouse where it could place the S&P 500 stocks, and then create and list shares in the warehouse itself for people to trade. The new warehouse-cum-fund would take advantage of the growth and electronic evolution in portfolio trading—the simultaneous buying and selling of big baskets of stocks first pioneered by Wells Fargo two decades earlier—and a little-known aspect of mutual funds: They can do “in kind” transactions, exchanging shares in a fund for a proportional amount of the stocks it contains, rather than cash. Or an investor can gather the correct proportion of the underlying stocks and exchange them for shares in the fund. Stock exchange “specialists”—the trading firms on the floor of the exchange that match buyers and sellers—would be authorized to be able to create or redeem these shares according to demand. They could take advantage of any differences that might open up between the price of the “warehouse” and the stock it contained, an arbitrage opportunity that should help keep it trading in line with its assets. This elegant creation/redemption process would also get around the logistical challenges of money coming in and out continuously throughout the day—one of Bogle’s main practical concerns. In basic terms, investors can either trade shares of the warehouse between themselves, or go to the warehouse and exchange their shares in it for a slice of the stocks it holds. Or they can turn up at the warehouse with a suitable bundle of stocks and exchange them for shares in the warehouse. Moreover, because no money changes hands when shares in the warehouse are created or redeemed, capital gains tax can be delayed until the investor actually sells their shares—a side effect that has proven vital to the growth of ETFs in the United States. Only when an ETF is actually sold will investors have to pay any capital gains taxes due.
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Robin Wigglesworth (Trillions: How a Band of Wall Street Renegades Invented the Index Fund and Changed Finance Forever)