Curriculum·R409 Grid, DCA, and Rule-Based Automation·about 33 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, ticker XIV, was a Credit Suisse note paying the inverse of the daily return of the S&P 500 VIX Short-Term Futures Index, an index of short-dated VIX futures, so its exposure reset every day, and Credit Suisse hedged that exposure by trading VIX futures. Its market capitalization had reached about $1.9B in the days before the event. On 5 February 2018 the VIX rose 115.6 percent, from a close of 17.31 to a close of 37.32. Keeping a daily inverse exposure hedged through a rise like that means buying VIX futures as they go up, and investors allege that Credit Suisse's hedging purchases drove the collapse. The indicative value fell from $108.37 to $4.22, about 96.1 percent, per the Second Circuit, and an acceleration provision triggered because the intraday value fell to 20 percent or less of the prior close. Credit Suisse announced the acceleration on 6 February, Nasdaq suspended trading after the close on 15 February, the accelerated valuation date, and on 21 February Credit Suisse paid $5.99 a note. 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
- $1,800,000,000
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.cohenmilstein.com/wp-content/uploads/2023/07/Credit-Suisse-2d-Cir-Decision.pdf
- https://www.sec.gov/Archives/edgar/data/1053092/000095010318002069/dp86855_ex9901.htm
- 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 XIV figures follow the Second Circuit's opinion in Set Capital v. Credit Suisse (27 April 2021): indicative value from $108.37 to $4.22, about 96.1 percent, and about $1.8B of investor losses as the court summarized the complaint, which is the loss_usd figure. ETF.com reported $115.55 to $4.22, a 96.3 percent fall, without reconciling it to the indicative value. The dates and the $5.99 payment are Credit Suisse's 6-K exhibit of 14 February 2018 and the opinion. Whether the note simply did what its documents described is contested: investors allege Credit Suisse's hedging engineered the collapse, the Second Circuit held in 2021 that the alleged conduct, if proven, was manipulative and revived those claims, and we have found no final judgment. This lesson uses the payoff shape only, which does not depend on how that case ends.
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.