Supply and demand is the idea that a price moves until the amount people want to buy matches the amount sellers want to sell. When something becomes scarcer or more wanted, its price tends to rise. When it becomes more plentiful or less wanted, its price tends to fall. It is the most useful single idea in economics for explaining why things cost what they do.
This guide walks through 20 real examples you can see in your own spending, many from 2025 and 2026. For each one, we say which side moved (supply, demand or both), what happened to the price, and what the example teaches.
The short answer. Most price changes you notice come from one of four moves: supply falls (a war, a drought, a disease), demand rises (a new technology, a holiday, panic buying), supply rises (a good harvest, new apartments), or demand falls (the season ends). Sellers increasingly adjust prices in real time to match demand, which is why the same ride, ticket or hotel room can cost very different amounts on different days.
How we wrote this. Each example is tied to official data or a named, published source, linked in the text and listed at the end. Figures are checked as of 1 November 2026 and are mostly from the United States. Where only press reports were available, we say so.
Supply and demand in 60 seconds
- Demand is how much of something buyers want at each price. At a lower price, people usually want more.
- Supply is how much sellers are willing to offer at each price. At a higher price, sellers usually offer more.
- The equilibrium price is where the two meet.
- A shift happens when something other than the price changes how much people want or offer, such as income, weather, technology or the price of a related good.
- Elasticity describes how strongly buyers or sellers react to a price change. People keep buying gasoline and eggs even when prices jump (inelastic demand), so prices swing a lot when supply changes.
| # | Example | What moved | Price effect |
|---|---|---|---|
| 1 | Gasoline in 2026 | Supply fell | Up sharply |
| 2 | Heating oil | Supply fell | Up sharply |
| 3 | Airline fares | Costs and supply | Up |
| 4 | Eggs and bird flu | Supply fell, then recovered | Spiked, then fell |
| 5 | Cocoa and chocolate | Supply fell, then recovered | Spiked, slow to fall in shops |
| 6 | Used cars in 2021 | Supply of new cars fell | Up |
| 7 | Memory chips | Demand rose | Up sharply |
| 8 | Electricity | Demand rose | Up |
| 9 | Gold | Demand rose | Up |
| 10 | Toilet paper in 2020 | Demand spiked | Shelves emptied |
| 11 | Ride-hailing surge pricing | Demand spikes | Up for minutes |
| 12 | World Cup tickets | Demand varies by match | Varies |
| 13 | Concert tickets and resale | Price set below demand | Resale markups |
| 14 | Hotels during big events | Demand spikes | Up for dates |
| 15 | Matinees and happy hours | Demand falls off-peak | Down |
| 16 | Seasonal fruit | Supply varies by season | Down in season |
| 17 | Post-holiday clearance | Demand collapses | Down |
| 18 | Apartment rents | Supply rose | Growth slowed |
| 19 | Wages | Demand for labor | Growth slowed |
| 20 | Price caps and shortages | Price held below equilibrium | Queues instead |
When supply falls
1. Gasoline prices in 2026
What happened. Shipping through the Strait of Hormuz, a route for a large share of the world's oil, was disrupted by conflict in the Middle East in 2026. Less oil reached world markets, and prices rose. In the U.S., regular gasoline averaged about $4.27 a gallon on 26 October 2026, roughly $1.23 more than a year earlier (EIA gasoline and diesel prices). The consumer price index for gasoline was up 34.2% over the year to September (BLS CPI).
The lesson. This is a supply shock. Demand for fuel barely changes in the short run, because people still need to drive to work, so a small drop in supply produces a big jump in price.
2. Heating oil
What happened. Fuel oil, used to heat many homes in the U.S. Northeast, rose 74.2% in the year to September 2026, about twice the rise in gasoline (BLS). It comes from the same crude oil as gasoline and diesel, so the same supply shock hit it.
The lesson. Related goods move together. When the supply of a shared input (crude oil) falls, every product made from it gets more expensive.
3. Airline fares
What happened. U.S. airline fares were up 22.4% over the year to September 2026 (BLS). Jet fuel is one of an airline's biggest costs, so when fuel prices rise, flying each seat costs more. Airlines respond by raising fares and trimming less profitable routes, which reduces the number of seats.
The lesson. Higher input costs shift supply. Sellers offer less at every price, so the price buyers pay goes up.
4. Eggs and bird flu
What happened. Highly pathogenic avian influenza killed 151.2 million U.S. egg-laying hens between February 2022 and April 2026, according to the USDA. Prices hit records in early 2025. As flocks were rebuilt, prices fell back: the USDA's May 2026 Livestock, Dairy, and Poultry Outlook reported an average retail price of $2.25 a dozen in April 2026, about 62% lower than a year earlier (The Poultry Site).
The lesson. Supply shocks in farming are often temporary, because producers can rebuild. High prices also give them a reason to rebuild faster.
5. Cocoa and chocolate
What happened. Poor weather and crop disease in West Africa, which grows most of the world's cocoa, cut global production by about 14% in the 2023/24 season, according to the International Cocoa Organization. Cocoa futures hit record highs above $12,000 a tonne in late 2024. As harvests improved, prices fell more than 40% by September 2025 (Anadolu Agency). But chocolate prices in shops stayed high into the 2025 holiday season.
The lesson. Prices are often "sticky" on the way down. Manufacturers buy cocoa months in advance under fixed contracts, so lower commodity prices take time to reach store shelves.
6. Used cars in 2021
What happened. A global shortage of computer chips in 2021 forced carmakers to cut production of new vehicles. Buyers who could not find a new car turned to used ones. The Manheim Used Vehicle Value Index, which tracks wholesale used-car prices, was 27.1% higher in September 2021 than a year earlier (Cox Automotive).
The lesson. When the supply of one good falls, demand moves to its substitutes, and their prices rise too. In September 2026, by contrast, used car and truck prices were down 1.5% over the year (BLS), as new-car supply had long since recovered.
When demand rises
7. Memory chips for computers and phones
What happened. Companies building AI data centers bought huge amounts of high-end memory in 2025 and 2026. Memory makers shifted factory capacity toward these more profitable server parts, leaving less for ordinary PCs and phones. Market research firm TrendForce estimated that contract prices for conventional DRAM rose by roughly 90% or more in the first quarter of 2026 alone and forecast a further 58% to 63% rise in the second quarter (TrendForce, 31 March 2026). Increases slowed later in the year.
The lesson. A demand surge from one group of buyers can raise prices for everyone else who uses the same product, because factories cannot be built overnight.
8. Electricity bills
What happened. U.S. electricity demand is growing for the first time in years, driven by data centers, manufacturing and electrification. The EIA expects electricity sales to commercial customers, which include data centers, to grow faster than residential sales, and forecasts an average residential price of about 18.2 cents per kilowatt-hour in 2026, up from about 17.3 cents in 2025 (EIA Short-Term Energy Outlook). The electricity index in the CPI was up 4.4% over the year to September 2026.
The lesson. Data centers are one driver among several, alongside grid upgrades and fuel costs. Higher demand matters most in regions where new power plants and transmission lines take years to build.
9. Gold
What happened. Central banks bought more than 1,000 tonnes of gold in both 2022 and 2023, the highest levels in decades, according to the World Gold Council. Buying stayed strong into 2026 as governments diversified their reserves and investors looked for safety during wars and trade disputes. Gold prices set a series of record highs over 2025 and early 2026.
The lesson. Gold's supply grows only slowly, because mining adds little each year to the existing stock. So price movements are mostly driven by changes in demand.
10. Toilet paper in March 2020
What happened. When COVID-19 lockdowns began, shoppers bought weeks of toilet paper at once. Total use did not change much, but demand at the store was concentrated in a few days, and many stores ran out. With offices and schools closed, more of that use also moved to homes, which buy different packs from different supply chains than workplaces do.
The lesson. Expectations move demand. If people expect a shortage, they buy more now, which creates the shortage they feared. Stores responded with purchase limits rather than higher prices, which is why the result was empty shelves instead of a price spike.
When sellers price for demand
11. Ride-hailing surge pricing
What happened. Uber raises prices in an area when demand is so high there are not enough cars, for example in bad weather, at rush hour or after a big event (Uber). Higher fares encourage more drivers to head to that area and some riders to wait, which brings the two sides back into balance.
The lesson. Prices can do two jobs at once: ration what is available right now and attract more supply. The trade-off is fairness, because a higher price falls hardest on people with less money.
12. World Cup 2026 tickets
What happened. FIFA used dynamic pricing for the 2026 World Cup in the U.S., Canada and Mexico for the first time, letting ticket prices rise or fall with demand. Group-stage seats started at $60, while the most sought-after matches were priced far higher (ESPN). The approach drew criticism, including a letter from U.S. lawmakers asking FIFA to lower prices.
The lesson. A popular match and a less popular one cost the same to stage, but demand for them is very different. Dynamic pricing lets the price follow demand, at the cost of making major events less affordable for ordinary fans.
13. Concert tickets and resale markups
What happened. Many artists set face-value prices below what fans are willing to pay, to keep shows affordable. When demand far exceeds supply, tickets sell out in minutes and reappear on resale sites for much more. In the UK, the Oasis reunion sale in 2024 prompted an investigation by the Competition and Markets Authority (CMA). The CMA found that Ticketmaster had used tiered pricing, where a higher-priced batch opened once a cheaper batch sold out, rather than dynamic pricing, and Ticketmaster agreed in 2025 to warn buyers about such systems in advance (CMA case page).
The lesson. When a price is set below the equilibrium, demand still has to be rationed somehow: by speed, by luck in a queue, or by resellers who capture the difference.
14. Hotels during big events
What happened. Hotel prices in a city rise sharply on the nights of a major sports final, festival or conference, then drop the next week. The number of rooms is fixed in the short run, so a burst of visitors pushes up the price of each room.
The lesson. When supply cannot change quickly, a rise in demand shows up almost entirely in price. Booking for a different weekend is often the easiest way to pay less.
15. Matinees, happy hours and off-peak travel
What happened. Cinemas charge less for afternoon shows, bars cut prices in the early evening, and flights and hotels are cheaper outside school holidays. Fewer people want these time slots, so sellers lower prices to fill seats that would otherwise go empty.
The lesson. This is the mirror image of surge pricing. When demand is low and the extra cost of serving one more customer is small, any price above that cost is better than an empty seat.
When the seasons and calendar move
16. Seasonal fruit and vegetables
What happened. Strawberries, tomatoes and other produce are cheapest when they are in season locally and most expensive when they must be grown in greenhouses or shipped from far away. Supply changes with the seasons, while demand is fairly steady.
The lesson. Buying what is in season is one of the simplest ways to use supply and demand to your advantage.
17. Clearance sales after holidays
What happened. On 1 November, Halloween candy and costumes go on sale. In January, it is wrapping paper and decorations. Demand for these items drops sharply after the holiday, and shops would rather sell at a discount than store the stock for a year.
The lesson. When demand collapses for a product that is costly to hold, sellers cut prices quickly. Patient buyers who can wait gain from this.
In housing, jobs and policy
18. Apartment rents after a building boom
What happened. U.S. builders completed about 608,000 multifamily homes in 2024, the most since 1986, according to the National Association of Home Builders' analysis of Census data (NAHB). With more apartments to choose from, renters gained bargaining power and asking-rent growth slowed sharply; some large markets saw rents fall. Shelter prices in the CPI were up 3.2% over the year to September 2026, slower than overall inflation.
The lesson. More supply is one of the most reliable ways to slow price growth. Because buildings take years to plan and complete, the effect arrives with a long lag.
19. Wages
What happened. Wages are the price of labor. When employers want to hire more workers than are available, wages rise faster. In 2026, U.S. job growth slowed: payrolls grew by just 29,000 in September, and average hourly earnings were up 3.0% over the year (BLS Employment Situation). With inflation at 3.7%, real (inflation-adjusted) hourly earnings fell 0.7% over the year (BLS Real Earnings).
The lesson. When the demand for labor cools, wage growth slows. Skills that are in short supply still command higher pay, which is why wages differ so much between occupations.
20. Price caps and shortages
What happened. When a government or company keeps a price below what the market would set, buyers want more than sellers offer. The result is a shortage, with queues, waiting lists or sold-out shelves instead of higher prices. Fuel queues during the price controls of the 1970s in the U.S. are a classic case. Rent control can have a similar effect on housing; we discuss a study of San Francisco in our 15 basic economic principles.
The lesson. Holding a price down does not make a scarce thing less scarce. It changes who gets it and how, often in favor of those with time to queue or connections.
How to use supply and demand in your own life
- Before a big purchase, ask what is moving. If prices are high because of a temporary supply shock (eggs, cocoa), waiting may pay. If they are high because of a lasting rise in demand (memory chips for AI), waiting may not help.
- Shift your timing. Off-peak travel, matinee tickets, in-season produce and post-holiday sales all use low demand in your favor.
- Look for substitutes. When one product gets scarce, a close substitute may not have caught up yet.
- Read price changes as information. A rising price tells you something is scarce. Asking why helps you predict whether it will last.
For the economic ideas behind these examples, read 15 basic economic principles everyone should understand. For how price rises add up across your whole budget, see 10 ways inflation affects your daily life.
FAQ
What is a simple example of supply and demand?
Concert tickets. When a famous band plays a small venue, many more people want tickets than there are seats, so tickets sell out and resale prices climb. If the same band played a huge stadium on a weeknight, there would be more seats than buyers and prices would have to drop.
What is the law of supply and demand?
The law of demand says that, other things equal, people buy less of something when its price rises. The law of supply says sellers offer more when the price rises. Together, they predict that the price will move toward the level where the amount demanded equals the amount supplied.
Why do prices go up quickly but come down slowly?
Sellers often buy inputs under long-term contracts, face costs like wages that rarely fall, and may test how much customers will accept. Retail chocolate prices staying high after cocoa prices fell is a recent example. Competition usually brings prices down eventually, but the lag can last months.
References
All accessed 1 November 2026.
- U.S. Energy Information Administration. Gasoline and diesel fuel update (26 October 2026); Short-Term Energy Outlook: electricity (October 2026).
- U.S. Bureau of Labor Statistics. Consumer Price Index, September 2026 (14 October 2026); The Employment Situation, September 2026 (2 October 2026); Real Earnings, September 2026 (14 October 2026).
- U.S. Department of Agriculture. Livestock, Dairy, and Poultry Outlook, May 2026, as reported by The Poultry Site.
- Anadolu Agency. Cocoa falls more than 40% amid waning drought concerns, increasing harvest (September 2025). International Cocoa Organization production estimates as cited in press coverage.
- Cox Automotive. Notes from the Q3 2021 Manheim Used Vehicle Value Index report.
- TrendForce. Press release on 2Q26 memory contract prices (31 March 2026).
- World Gold Council. Gold Demand Trends Full Year 2023: Central banks.
- Uber. How surge pricing works.
- ESPN. 2026 World Cup tickets: FIFA confirms use of dynamic pricing (2025).
- UK Competition and Markets Authority. Ticketmaster: consumer protection case.
- National Association of Home Builders. Multifamily completions climb near a 40-year high (July 2025).