Westpac chief economist Kelly Eckhold says New Zealand petrol prices risk rising again as international crude reclaims US$100 a barrel and firms lose room to absorb earlier war spikes.
Brent crude settled at US$101.21 a barrel, up 3.4%, according to Reuters settlement figures reported by Al-Monitor. West Texas Intermediate closed at US$96.05, up 3.25%. Both prints were the highest closes since 22 May.
Yahoo Finance last-day Brent futures (BZ=F) traded near US$101.98, with a 52-week high of US$126.10 and a 52-week low of US$58.72. WTI futures (CL=F) were near US$97.06, against a 52-week high of US$119.48.
Goldman Sachs, via Bloomberg, said oil may rally to as much as US$120 a barrel if attacks on shipping in the Middle East rise. That is a conditional risk case, not a base-case year-end target. Brent's already-realised 52-week high above US$126 shows US$120 sits inside this conflict's traded range.
The household arithmetic
At the early-September snapshot, New Zealand 91 unleaded was sitting at just over NZ$3 a litre. Each 10 cents per litre on a 50-litre tank costs a household about NZ$5 per fill. Diesel moves hit courier and freight margins directly and feed into goods prices.
Eckhold warned that a prolonged conflict raises the chance some firms that deferred full pass-through on the first crude spike will no longer hold the line. New Zealand imports essentially all transport fuel off international benchmarks, so landed costs lag crude and Singapore product by days to a few weeks.
Westpac chief economist Kelly Eckhold said there was a danger that the prolonged nature of the conflict could mean some firms — who may have initially held off price increases from high oil prices — will no longer be able to do so.
Hormuz still below pre-war peak
The Strait of Hormuz remains central. The US Energy Information Administration has long put typical oil flows through the strait at about one-fifth of global petroleum liquids consumption. IEA and shipping trackers show Hormuz volumes still far below pre-war peaks even after earlier de-escalation hopes.
A soft kiwi multiplies the pain. NZD/USD traded near 0.58 on Yahoo Finance samples, inside a 52-week range of roughly 0.56 to 0.61. Weaker NZD lifts the local-dollar cost of USD-priced crude and refined product.
Wall Street's inflation problem
Wall Street sold the US$100 break ahead of US CPI. Markets fretted an oil-boosted inflation print could push the Federal Reserve toward a hike even as global bond yields rose. Thirty-year US yields had already hit their highest level since 2007 in the same week, per contemporaneous market reporting.
For New Zealand banks, the transmission path is familiar. Higher petrol and diesel lift the CPI fuel contribution. A sticky tradables shock complicates any Reserve Bank easing narrative and can keep the OCR — and mortgage rates — higher for longer. Owner-occupiers and investors feel that through fortnightly repayments and thinner discretionary spend.
Westpac is the named major-bank voice on the lag risk. Peer desks at ANZ, ASB and BNZ typically re-run near-term CPI fuel notes when crude sticks above round numbers; the household arithmetic does not change with the logo on the economist's slide.
How far could this run
If Brent sustained a move from about US$100 toward Goldman's conditional US$120 case, that would be a roughly 20% crude uplift before refining margins, freight, tax and retail margins map into the pump. Incomplete pass-through to date relative to earlier war highs on the futures curve leaves upside risk even if the curve later softens.
Importers, distributors, airlines on jet fuel, and exporters facing higher logistics costs sit next in line. MBIE stockholding and tanker ETAs become operational and political issues if insurance premia and voyage times stretch further.
Over one to three months the banking-book story is pump prices, CPI contribution and household cashflow. Over six to twelve months it is whether a sticky energy shock revises the RBNZ track, bank funding costs, and credit demand — with mortgage holders paying the spread if policy stays restrictive longer than a soft-landing script assumed.
