Debt, yields and AI: The chief economists' view, and other finance news to know

The headline economic outlook may be stabilizing, but underlying market dynamics tell a much more complex story.

The September 2026 Chief Economists’ Outlook from the World Economic Forum reveals an environment marked by elevated public debt, diverging monetary policy expectations and a tech capex boom increasingly reliant on debt financing. With fiscal buffers constrained and long-term yields high in the US and Japan, the outlook points to growing risks around stretched valuations, AI financing and investment returns.

Core financial takeaways:

1. Valuation frictions & the AI credit engine

Market enthusiasm for tech infrastructure is running into credit market realities and capacity constraints.

2. Private capital & dealmaking realignment

Investment in strategic sectors is becoming more concentrated, while private equity allocations in Asia are shifting.

3. Sovereign supply & yield curve pressures

Heavy public debt and diverging rate expectations are the backdrop to rising long-term yields in the US and Japan.

4. Energy & infrastructure investment

Power-hungry digital infrastructure and energy security needs are driving demand for additional capacity and investment.

The survey points to a more balanced outlook. On the upside, a stabilizing global economy and continued investment in AI and energy are creating opportunities. On the downside, stretched valuations and constrained public finances pose investment risks.

Whether investment in AI and energy can translate into sustainable returns remains one of the central questions for the year ahead.

As chief economists flag the risk of asset price corrections, new International Monetary Fund (IMF) analysis examines how hedge funds could affect market stability under stress.

Since 2013, hedge funds' gross assets under management have tripled to $13 trillion, with gross notional exposures of about $40 trillion, according to the IMF’s latest Global Financial Stability Report. And the industry is still growing: global industry capital reached a record $5.6 trillion in the second quarter of 2026, HFR reports.

In normal times, that scale can support liquidity and price discovery. But leverage, crowded positions and rapid investor withdrawals can turn hedge funds into "amplifiers of market stress", the IMF warns.

A bigger footprint in sovereign debt

Hedge funds hold about 9% of the US Treasury market, up from 4% in 2022, according to Reuters. Meanwhile, the Federal Reserve says that US hedge funds' repo borrowing reached $3 trillion as of September 2025, with the 50 largest hedge funds accounting for about 90% of gross Treasury exposures.

A key strategy, the basis trade, uses borrowed money to profit from small price gaps between Treasury bonds and futures. The IMF notes it supports liquidity when funding is cheap, but hedge funds may be forced to unwind positions quickly when borrowing costs rise. The trade has now shrunk to its smallest size in over two years.

Leverage and crowding

Hedge fund leverage is rising. Equity prime brokerage balances are at record levels, up around 40% globally in the past year, with positions concentrated in sectors such as semiconductors as AI-linked share prices climb, the Bank of England says.

That concentration carries a cost. In periods of stress, the stocks most widely held by hedge funds are 10 percentage points more volatile and fall 4 percentage points further from peak to trough than the least crowded stocks, the IMF finds. Losses can also weigh on prime brokers, and stress can spread across borders, particularly to less liquid markets.

Tighter oversight ahead

Mandatory central clearing of US Treasury cash trades begins on 31 December 2026, with repo trades following on 30 June 2027, bringing more of hedge funds’ Treasury activity under margin requirements. Beyond this, the IMF calls for:

As a Bank of England official put it, the question is "where that leverage resides, how concentrated it is, how it is financed, and how it interacts with the rest of the financial system".

Rates top wealthy investors' worries: Family offices and high-net-worth individuals see rising interest rates and yields as the biggest threat to global economic growth, a Deutsche Bank survey found. Asia was seen as the most stable geopolitical region over the next 12 months, with 73% of respondents choosing it, ahead of the US at 14%.

Fed supervision shake-up: The Fed will create five new geographic regions for bank supervision, each led by a regional leader accountable to Washington. The move is part of a broader push to strengthen accountability and streamline oversight, following a review of the Fed's supervision of Silicon Valley Bank.

Japan raises the bar for TOPIX: 683 companies are at risk of removal from Japan's benchmark stock index under stricter inclusion criteria. The changes aim to improve the index's quality and encourage companies to deliver stronger returns to shareholders. Rolling out through July 2028, they could affect nearly $1 trillion in assets tracking the index, according to the Financial Times.

Africa's own rating agency: The African Union has launched a homegrown credit rating agency to provide an alternative to the major international ratings firms. Endorsed by African leaders in 2018 amid concerns over how the continent is assessed and the borrowing costs that can result, the Africa Credit Rating Agency must now establish credibility with investors, with its methodology likely to face close scrutiny, writes Bloomberg.

How AI could cost banks: AI agents that move customers' idle cash into higher-yielding accounts and investments could squeeze banks' deposit profits. The FT estimates that US banks could ultimately lose about $500 billion in equity value if their $20 trillion deposit base were to earn market-like returns, though cost savings and other efficiency gains from AI could offset some of the hit.

Why do so many hard-tech innovations struggle to move from pilot to commercial scale? This article reveals how financing, insurance and procurement can determine whether promising technologies make it beyond the pilot phase, highlighting three shifts that could help close the gap.

Infrastructure finance is often framed around one question: how can we mobilize more capital? But the bigger challenge may be designing financing around the very different starting points and needs of individual economies. Cheukai Makari of the Forum's Centre for Financial and Monetary Systems, Sustainable Finance, explores why a one-size-fits-all approach can hold back real economy transformation and what a more tailored model could look like.