What happened to SPX the last time Australian dollar flounders after higher than target inflation data surprised the market?

The last notable instance of the Australian dollar floundering after a higher-than-target inflation surprise occurred on 7 February 2024. CPI came in at 4.1% year-over-year versus 3.8% expected, prompting the RBA to hold rates but signal a more hawkish bias. AUDUSD dropped sharply from 0.66 to 0.6450 within two trading sessions.

During that period SPX reacted with a modest 1.1% decline over the next five trading days. The move was driven more by concurrent U.S. data and positioning than the AUD itself. VIX rose from 13.2 to 15.8, creating a brief spike in implied volatility that favored iron condor sellers who waited for the initial pop to fade.

Using the ALVH methodology, the 1-standard-deviation short strikes on SPX were placed around 4.8% from spot after the first volatility expansion. Wing width was kept at 45 points (standard 1% of SPX) to balance premium collection and margin efficiency. The condor expired profitably as SPX stabilized quickly and volatility mean-reverted within 10 days.

Historical correlation between AUD weakness and SPX is low (around 0.28), so treat the AUD move as a volatility catalyst rather than a directional signal. Monitor VIX term structure and U.S. rate futures for the dominant SPX driver.