Level 1 — Absolute Beginner

Oil is very expensive this week. One barrel of oil now costs more than 100 dollars. This is the highest price since July.

The price is going up because of a problem between the United States and Iran. Many ships carry oil through a narrow sea passage called the Strait of Hormuz. People are worried that ships cannot pass safely there.

Stock prices are going down. On Tuesday, the Dow Jones (a list of 30 big American companies) fell by 628 points. On Wednesday, it fell about 300 points more.

People are waiting for new news about prices in the United States. They also want to know what the Federal Reserve, the bank that controls US money, will do next week.

barrel

A large round container. Oil is measured and sold in barrels.

crude oil

Oil in its natural, unprocessed form, before it is made into fuel.

Dow Jones

A number that shows how 30 large American companies are doing on the stock market.

stock market

A place where people buy and sell small parts of companies.

strait

A narrow strip of sea that connects two larger seas.

tension

A feeling of worry or conflict between two countries or groups.

inflation

When prices for things people buy go up over time.

Federal Reserve

The central bank of the United States, also called the Fed.

Level 2 — Elementary

The price of oil jumped this week, and the reason is a growing conflict between the United States and Iran. Brent crude, which is the main price that oil is measured by around the world, rose about 3 percent and moved above 100 dollars a barrel for the first time since July.

The worry is about the Strait of Hormuz, a narrow stretch of water that many oil tankers pass through. If ships cannot travel safely there, less oil reaches the rest of the world, and less oil usually means higher prices. Qatar's government said that continued disruption could cause an industrial catastrophe. A company that tracks ships, Kpler, said the number of ships passing through the strait each day has dropped to its lowest level since May.

Higher oil prices scared investors on the stock market. On Tuesday, the Dow Jones Industrial Average fell 628.18 points, or 1.18 percent, closing at 52,786.07. The S&P 500, which tracks 500 large companies, fell 0.58 percent, and the Nasdaq Composite, which focuses more on technology companies, fell 0.32 percent.

On Wednesday, the market was mixed. Technology and AI companies held up better than the rest of the market, but the Dow still fell about another 300 points. Investors are now watching for new inflation numbers this week and for what the Federal Reserve decides at its meeting next week.

Brent crude

The main international price benchmark for oil, used around the world.

tanker

A large ship built to carry oil or other liquids.

disruption

Something that stops normal activity from continuing as usual.

industrial catastrophe

A very serious and damaging problem for factories, trade, and the economy.

S&P 500

A stock market index that tracks 500 of the largest companies in the United States.

Nasdaq Composite

A stock market index that includes many technology companies.

interest rate

The extra amount a bank charges, or pays, on borrowed or saved money.

benchmark

A standard price or measurement that others are compared against.

Level 3 — Intermediate

Oil prices surged this week as rising tension between the United States and Iran over the Strait of Hormuz rattled global markets. Brent crude, the international benchmark, climbed about 3 percent to trade above 100 dollars a barrel, its highest level since July, while US crude, known as West Texas Intermediate, also pushed above 93 dollars a barrel.

The Strait of Hormuz is one of the world's most important oil chokepoints, and any threat to shipping through it tends to send prices climbing quickly. Qatar's government warned that continued disruption could lead to an industrial catastrophe, and Kpler, a firm that tracks global shipping data, reported that the average number of vessels passing through the strait each day has fallen to its lowest level since May.

The impact on equities was immediate. On Tuesday, the Dow Jones Industrial Average dropped 628.18 points, or 1.18 percent, to close at 52,786.07, while the S&P 500 slipped 0.58 percent to 7,673.52 and the Nasdaq Composite eased 0.32 percent to 26,421.41. On Wednesday, the picture was more mixed: technology and semiconductor stocks, buoyed by continued enthusiasm for artificial intelligence, held up better than the broader market, but the Dow still shed roughly another 300 points, or about 0.6 percent, and the S&P 500 lost about 0.3 percent as inflation concerns tied to oil prices persisted.

Attention is now turning to fresh US inflation data due later this week, which investors will parse closely ahead of the Federal Reserve's policy meeting next week. Markets are currently pricing in roughly a 60 percent chance that the Fed will raise interest rates by a quarter of a percentage point, as policymakers weigh the risk that higher oil prices could push inflation higher against the risk of slowing an already fragile economy.

chokepoint

A narrow strategic passage, such as a strait, that is critical to trade and can be easily blocked.

equities

Shares of ownership in companies, also known as stocks.

semiconductor

A material and the chips made from it that power computers, phones, and AI systems.

policy meeting

A scheduled meeting where a central bank decides on interest rates and other economic measures.

quarter of a percentage point

A small unit of change, equal to 0.25 percent, often used to describe interest rate moves.

buoyed

Supported or lifted up, often used to describe prices rising due to positive news.

vessel

A ship or boat, especially a large one used for shipping goods.

fragile economy

An economy that is weak or unstable and could be easily harmed by new shocks.

Level 4 — Advanced

A sharp escalation in the standoff between the United States and Iran over the Strait of Hormuz sent shockwaves through global energy and equity markets this week, driving Brent crude, the international benchmark, roughly 3 percent higher to trade above 100 dollars a barrel for the first time since July. West Texas Intermediate, the domestic US benchmark, followed in tandem, breaching 93 dollars a barrel as traders priced in the growing likelihood of supply disruption in one of the world's most consequential maritime corridors.

The strait, through which a substantial share of the world's seaborne oil trade transits daily, has become the focal point of investor anxiety. Qatar's government issued a stark warning that prolonged disruption to shipping could precipitate an industrial catastrophe, underscoring how deeply the Gulf's economies remain intertwined with the free flow of tankers through the passage. Kpler, the shipping data firm whose vessel tracking is closely watched by traders and policymakers alike, reported that average daily transits through the strait have fallen to their lowest level since May, a tangible sign that the standoff is already reshaping commercial behavior well ahead of any formal blockade.

Equity markets registered the anxiety in short order. The Dow Jones Industrial Average tumbled 628.18 points, or 1.18 percent, on Tuesday to close at 52,786.07, while the S&P 500 retreated 0.58 percent to 7,673.52 and the Nasdaq Composite eased a more modest 0.32 percent to 26,421.41, a divergence that hinted at the sector rotation to come. By Wednesday, that rotation had crystallized: technology and semiconductor names, propped up by an unrelenting appetite for artificial intelligence exposure, outperformed the broader tape even as the Dow shed a further 300 points, roughly 0.6 percent, and the S&P 500 slipped about 0.3 percent on renewed oil driven inflation anxiety.

The market's attention now pivots to fresh domestic inflation data due later this week, which will be scrutinized as the last major data point ahead of the Federal Reserve's policy meeting next week. Futures markets are currently assigning roughly a 60 percent probability to a quarter point rate increase, reflecting a delicate calculus among policymakers who must weigh the inflationary impulse of costlier crude against the risk that tighter policy could further strain an economy already showing signs of fragility.

escalation

A rapid increase in the seriousness or intensity of a conflict.

maritime corridor

A recognized sea route used for shipping and trade between regions.

precipitate

To cause something, often something bad, to happen suddenly.

transit

The act of passing through a place, such as a strait, on the way to a destination.

sector rotation

When investors shift money out of some industries and into others based on changing conditions.