For professional clients only. The information contained within this post is not intended for retail clients.
30 October 2026
Market sell-offs arrive with a local explanation. Brazil’s equity market lost almost 14 per cent in a day after an election surprise. Indonesian shares fell nearly 12 per cent in a session as their emerging-market index status came under threat. Turkey entered October after its worst monthly stock-market decline since 2008, following a fund liquidity crisis. All three episodes unfolded within a few weeks of each other, around and after the Fed’s September return to tightening. That could be coincidence. But repeated outsized moves in different markets suggest investors should look beyond the local explanations.
The local trigger and the conditions that amplify it are different questions. A political surprise can explain why investors sell. It says less about the scale of the move, the market’s capacity to absorb it or the consequences for positions elsewhere.
Value-at-risk limits provide a mechanism. Higher measured volatility can force investors to reduce exposures. Redemptions and margin calls create demands for cash. Managers may sell what they can, including assets whose fundamentals have scarcely changed. A disturbance in one market can therefore reduce the appetite for risk in another.
This does not prove that the same investors transmitted these losses, or that Fed tightening caused them. It does explain why local shocks can have wider consequences.
Corporate credit gives them another reason to look. Between the eve of September’s Fed increase and Wednesday’s close, spreads on BBB-rated US debt rose by roughly 10 per cent, compared with 15 per cent for BB-rated bonds and 20 per cent for CCC-rated debt and below. Across those tiers, weaker credit suffered greater proportional widening. The premium on the weakest debt rose by a fifth despite starting above ten percentage points over Treasuries.
Last week, in Testing the Toleration Boundary, we asked how long private borrowers could withstand elevated financing costs alongside heavy government borrowing. The answer varies. Strong companies can keep investing while weaker ones conserve cash or negotiate with creditors. Aggregate growth can remain respectable while some borrowers’ debt burdens become unsustainable.
Microsoft illustrates the distinction. On Thursday, it priced $25bn of debt, including thirty-year notes carrying a 6.25 per cent coupon. Strong borrowers can still secure long-term financing. Their continued access helps explain why distress elsewhere need not force the Fed to ease.
Wednesday’s Fed decision offered little encouragement to borrowers awaiting relief. The committee held its target range at 3.75–4.00 per cent, with two members preferring another quarter-point increase. Its statement described strong activity, resilient spending and robust investment. Inflation remained elevated. Weak credits were not its overriding concern.
Some of that deterioration is easier to postpone than recognise. The Reserve Bank of Australia warned this month that payment-in-kind interest could conceal borrower stress. Adding unpaid interest to principal preserves cash and can keep a loan current under revised terms. It does not establish that the borrower can service the enlarged debt.
The lender’s claim grows while the assets supporting it may depreciate. Where collateral falls short of the loan balance, capitalising interest increases the shortfall unless asset values recover. A larger contractual entitlement is poor compensation for a smaller prospect of repayment.
Lower Treasury yields would not necessarily resolve this. Weaker growth could bring government borrowing costs down while pushing corporate credit premiums higher. A borrower gains little if those movements cancel out. Holders of long-dated Treasuries could profit from deteriorating corporate conditions while vulnerable companies remain under pressure.
The question is when selective losses become broad enough to change the Fed’s calculation. Repeated market shocks and disproportionate pressure on weaker credits are reasons to watch that boundary closely. They are not yet proof it has been crossed. Until then, borrowers face deadlines policymakers do not share. Asset sales, fresh equity or creditor losses may arrive before monetary relief. Capitalising interest can delay the reckoning; it cannot supply missing cash. The Fed can wait for evidence. Some borrowers cannot.