Withhold an equity regime label until credit-linked ratios agree

One equity break is not a regime

During the 2008-2009 credit-stress window, the archive used two credit-linked ratios to place an equity move in market regime classification. The first is the treasury-equity ratio: a long Treasury yield divided by a broad equity index, used to flag bond-stock dislocations. The second is the credit-equity fear ratio: an investment-grade credit-protection index divided by equity implied volatility, used to compare stress across markets.

Editorial reading: Event-driven context supplies the dated stress window. Fundamental overlay supplies the credit comparison. Market regime classification is the label that should wait for both.

The treasury-equity ratio as an intermarket-lead

The archive described a ratio of the 10-year US Treasury yield to the S&P 500 as a way to mark money-flow dislocations between government bonds and equities before those dislocations were obvious on the equity series itself. That pattern is an intermarket-lead: a ratio break that appears before the matching move on the equity index itself.

On 22 September 2008 the yield-to-index ratio gapped higher from a six-week base and crossed its 50-day moving average. The S&P 500 was not described as breaking down until 29 September 2008. After that late-September equity breakdown, the case study recorded the S&P 500 falling from 1200 to 741, a 38 percent decline, inside two months.

The same ratio built an October-December double top and dropped through its 50-day moving average on 24 November, one day after the index bottomed near 741 and then rose about 200 points, or about 27 percent. On 1 January 2009 the ratio broke upward from a short double bottom. On 6 January the index began another decline. At the archive's time of writing, the index stood at 676.53, about 27 percent below that January start.

The credit-equity fear ratio as a relative-fear gauge

An investment-grade credit-default-swap index divided by equity implied volatility was treated as a relative-fear gauge. A rising ratio was read as more stress in credit than in equities. A falling ratio was read as more stress in equities than in credit.

An uptrend channel in that credit-to-equity fear ratio broke down around 20 September 2008, after which the equity market was described as dropping 34 percent. A symmetrical triangle in the same ratio from October into mid-November resolved higher around 24 November, coinciding with an S&P 500 advance from about 750 to 931 that was labeled a 24 percent bear-market rally beginning 21 November.

When the two checks agree

Editorial reading: the late-September cluster is the clearer agreement. The treasury-equity ratio broke higher on 22 September 2008. The credit-equity fear ratio's uptrend channel broke down around 20 September 2008. The dated stress event is that same September window. The equity breakdown was described only on 29 September. That sequence is why a single equity print is a late label, not the start of market regime classification.

The late-November cluster is the other agreement. The treasury-equity ratio lost its 50-day moving average on 24 November, one day after the index bottomed near 741. The credit-equity fear ratio's triangle resolved higher around the same date, coinciding with the advance labeled a bear-market rally from 21 November. Editorial reading: those two ratio prints and the dated November event are the backdrop. The equity rally is the matching move, not a standalone regime change. A ratio can lead or only line up with the equity move. Neither print is a trade.