Assets of top oil funds quadruple to $5.4 bn since July, Contango structure trims gains through roll costs

The United States Oil Fund, which invests in oil futures contracts, was guaranteed to be a losing bet over time, but retail investors piled into the exchange-traded fund, perhaps believing it was a bet on the spot price of oil.

Debate about flight scandal has detracted attention from strategic changes and oversight at world’s biggest sovereign wealth fund