NEW YORK (AP) — Already feeling pinched since the start of the Iran war, consumers are likely to feel more pain ahead as oil prices pushed past $100 a barrel Thursday amid renewed fighting and military strikes that have left global oil supplies stranded in the Middle East. This was reported by Qazaqyia.kz citing Associated Press.

The elevated price marked a turn from lower oil prices enjoyed briefly when hostilities between the U.S. and Iran waned in June. Brent crude, the international standard, last reached $100 a barrel in May.

Companies that produce and sell fresh food, school supplies and anything that gets shipped using fuel reported cost impacts from an earlier spike in energy prices after the U.S. and Israel attacked Iran. They’re likely to continue passing some of their increased expenses to consumers.

“In general, once you have an increase in costs, businesses are fast in increasing the price,” said Miguel Gomez, director of Cornell University’s Food Industry Management Program. But, he noted, “it takes more time to lower prices when the costs go down.”

Here’s how higher oil prices could further impact consumers’ wallets.

Gasoline prices

Volatility along the Strait of Hormuz and broader regional instability pushed up the price of crude oil, the main ingredient in gasoline, and could continue to make driving costlier during the second half of summer, according to motor club AAA.

The average U.S. price for regular gasoline reached $4.09 a gallon Thursday, up 15 cents from a week ago, with drivers in most states now paying $4 or more, according to AAA.

“Given the typical lag along the oil industry’s supply chain, prices at the pump are poised to keep rising at least into next week,” said Pavel Molchanov, investment strategy analyst at Raymond James. But he noted that futures prices for oil delivered later this year and next year are lower, suggesting prices could fall once military action ends.

For the most part, higher gasoline prices haven’t stopped Americans from driving. Gasoline demand rose 1% to 8.9 million barrels per day last week, according to the U.S. Energy Information Administration.

Pressure on gasoline prices could persist because fewer refineries are available to process crude than before the conflict. Refineries in the Middle East have been damaged, and Ukrainian attacks have damaged refineries in Russia.

Grocery prices

Grocery prices generally rise with oil because farmers use diesel fuel to power equipment, while many food products are transported by trucks that require fuel.

“Oil at $100 doesn’t make food prices jump right away, but it does put upward pressure across the food supply chains, especially for categories that depend heavily on trucking, cold storage and packaging,” Gomez said. Fresh produce and dairy could feel a larger impact because they require refrigeration during delivery.

Imported goods are also vulnerable to higher shipping costs.