ProShares Ultra and UltraShort Sector ETFs: Does 2 = 2? [View article]
The NAV changes are not supposed to add to zero. The logarithms of the changes are. In the short fund, if the asset goes to infinity, you don't lose infinitely. You only lose what you paid for the shares in the short fund.
ProShares Ultra and UltraShort Sector ETFs: Does 2 = 2? [View article]