Curriculum·R409 Grid, DCA, and Rule-Based Automation·about 32 min
The structural insight: a grid is a short-volatility position
By the end of this lesson you can
- →State the payoff identity: capped above, nearly unbounded below
- →Compare a grid against simply holding across three regimes, in one table
- →Explain why buy-low-sell-high rebalancing is concave relative to holding
- →Name what the grid is being paid for, and what it is short
Senior · enrolled learners
This lesson opens with XIV, 5 February 2018, read as a payoff.
- What happened
- The VelocityShares Daily Inverse VIX Short-Term ETN held a short position in short-dated VIX futures and rebalanced daily to maintain constant inverse exposure. It had about $1.9B of assets on the preceding Friday. On 5 February 2018 the VIX rose 115.6 percent from a close of 17.31 to a close of 37.32, the daily rebalance obliged the product to buy VIX futures as they rose, its indicative value fell from $115.55 to $4.22, and an acceleration provision triggered when the intraday value fell to 20 percent or less of the prior close. The point relevant here is not the size of the loss but the shape of the payoff that produced it: a position that earned a small amount on the large majority of days and gave back the accumulated total on one.
- The decision point
- The product was described by what it collected and priced by what it was short. A grid is described the same way, by its profit per completed cycle, and it is short the same thing: the possibility that the price leaves the region where the rule earns. Reading a grid's advertised return without reading its payoff is the identical error, and the payoff is derivable from R409-01's five parameters without any market data at all.
- Recorded loss
- $1,900,000,000
What you will be able to answer
- →What is the payoff identity?
- →How does a grid compare with holding?
- →Why is rebalancing concave?
- →What is the grid paid for?
Orientation and Year One are open: anyone can read them without an account. From Year Two onward the lessons are for enrolled learners, because progress through the later years only means anything if it is tracked against a record.
It is free. We do not sell the list and there is nothing to buy at the end of it.
Sources and review
- https://www.etf.com/sections/news/inverse-vix-etn-shuts-down
- https://www.cnbc.com/2018/02/06/the-obscure-volatility-security-thats-become-the-focus-of-this-sell-off-is-halted-after-an-80-percent-plunge.html
- https://www.sixfigureinvesting.com/2019/02/what-caused-the-february-5th-2018-volatility-spike-xiv-termination/
- https://www.federalreserve.gov/pubs/feds/2007/200713/200713pap.pdf
Confidence high·Volatility low·Reviewed 2026-08-07·Owner unassigned
Contested
R401-05 uses XIV as a basis and carry case, deriving what one reversal does to years of accumulated returns. This lesson uses the same product for its payoff shape only, in order to name the identity a grid shares with it. Two different arguments from one incident and the split is deliberate. Keep it and do not re-derive the compounding here.
The three-regime comparison in part two uses R409-01's stated configuration and three stated price paths. Real paths are not clean and a real grid would complete a different number of cycles in each. Per R409-L2 the lab requires backtesting the learner's own configuration across real ranging, rising and falling periods with fees and funding included.
J303-02 owns liquidity provision and impermanent loss. S210-02 owns the rebalancing comparison at Sophomore level. This lesson owns the option identity. Keep the splits.