{"id":33048,"date":"2026-09-05T19:11:08","date_gmt":"2026-09-05T19:11:08","guid":{"rendered":"https:\/\/alchemymarkets.com\/?post_type=market_insights&p=33048"},"modified":"2026-09-05T19:11:09","modified_gmt":"2026-09-05T19:11:09","slug":"inflation-central-banks-and-the-sp-500s-bull-flag-test","status":"publish","type":"market_insights","link":"https:\/\/alchemymarkets.com\/sv\/education\/market-insights\/weekly-outlook\/inflation-central-banks-and-the-sp-500s-bull-flag-test\/","title":{"rendered":"Inflation, Central Banks and the S&P 500\u2019s Bull-Flag Test"},"content":{"rendered":"\n

Markets head into a potentially important week with monetary policy once again at the centre of the conversation. In the US, the September Federal Reserve decision remains finely balanced after Kevin Warsh used his Jackson Hole address to place renewed emphasis on inflation risks, full employment and financial conditions that remain relatively supportive.<\/p>\n\n\n\n

That has put next week\u2019s US inflation report firmly in the spotlight. At the same time, the European Central Bank faces its own inflation problem, with another rate increase increasingly looking possible as the eurozone economy continues to show resilience.<\/p>\n\n\n\n

For equities, the question is whether this renewed policy uncertainty can interrupt the broader bullish trend. So far, the S&P 500 is holding its ground, with the four-hour chart showing a technically constructive consolidation rather than a clear deterioration in momentum.<\/p>\n\n\n\n

US: September Fed decision could hinge on inflation<\/h2>\n\n\n\n

The outcome of the September FOMC meeting remains uncertain.<\/p>\n\n\n\n

Following Warsh\u2019s Jackson Hole Symposium address, the argument for another rate increase has strengthened. His message was relatively clear: inflation remains too high, employment is still strong and financial conditions do not appear restrictive enough to guarantee that inflation returns to target.<\/p>\n\n\n\n

That creates the case for what could be viewed as a precautionary or \u201cinsurance\u201d hike<\/strong>.<\/p>\n\n\n\n

The logic is similar to the approach taken by the Greenspan Fed during the mid-1990s. Rather than waiting for a renewed inflation problem to become obvious, the central bank could choose to tighten pre-emptively while economic conditions remain strong enough to absorb it.<\/p>\n\n\n\n

However, this is not yet a settled decision.<\/p>\n\n\n\n

As discussed previously, there are legitimate reasons to question whether the inflation picture is quite as threatening as Warsh suggests. Underlying measures have been moderating, wage-cost pressure has cooled and productivity growth has helped contain unit labour costs.<\/p>\n\n\n\n

The key question is therefore no longer simply whether inflation remains above target.<\/p>\n\n\n\n

It is whether the latest increase in energy, import and business input costs is beginning to spread back into underlying inflation<\/strong>.<\/p>\n\n\n\n

That makes Friday\u2019s CPI report particularly important.<\/p>\n\n\n\n

August CPI could decide the argument<\/h3>\n\n\n\n

US August inflation is released on Friday 11 September<\/strong>.<\/p>\n\n\n\n

Headline CPI is expected to be relatively hot, with a monthly increase of around 0.4%<\/strong> as higher energy costs feed through to the index.<\/p>\n\n\n\n

Core inflation, however, is expected to be softer at around 0.2% month-on-month<\/strong>.<\/p>\n\n\n\n

That divergence is important.<\/p>\n\n\n\n

A hot headline figure driven predominantly by energy would not necessarily prove that the underlying inflation process is accelerating again. But the Fed will be watching closely for evidence that higher energy costs are starting to influence freight, air fares and broader services prices.<\/p>\n\n\n\n

The transmission mechanism matters:<\/p>\n\n\n\n

Energy prices rise
\u2192 transport and freight costs increase
\u2192 businesses face higher operating costs
\u2192 some costs are passed to consumers
\u2192 core inflation becomes stickier.<\/strong><\/p>\n\n\n\n

If Friday\u2019s report shows that process beginning to appear, the argument for a September hike becomes significantly stronger.<\/p>\n\n\n\n

Conversely, another relatively contained core reading would strengthen the case that the latest inflation shock is still concentrated in specific categories rather than becoming a broader second-round inflation problem.<\/p>\n\n\n\n

That means Friday could be one of the most consequential US data releases ahead of the FOMC meeting.<\/p>\n\n\n\n

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Eurozone: ECB increasingly looks set to hike<\/h2>\n\n\n\n

Europe faces a similar, although not identical, policy problem.<\/p>\n\n\n\n

The case for another ECB rate increase has strengthened since the July meeting, when several policymakers were already open to further tightening.<\/p>\n\n\n\n

Since then, the eurozone economy has shown considerably more resilience than might have been expected given the disruption caused by the conflict in the Middle East.<\/p>\n\n\n\n

At the same time, headline inflation has continued moving higher and could remain above 3% year-on-year<\/strong> through the remainder of the year.<\/p>\n\n\n\n

That combination creates a relatively straightforward near-term problem for the ECB:<\/p>\n\n\n\n

**Growth has held up <\/p>\n\n\n\n