…and 183 to go, how is my short TNA short TZA pair trade going?
Rather well, thanks for asking. Even if we get half the decay we’ve seen in the last 7 days, every seven days, the pair will erode to 41% of their value from today. (((-6.7% / 2) + 1) ^ (183 / 7)) = 0.41…or a -59% win, on the unleveraged short. Good thing, I’m leveraged. 
click to expand.