Why are prices rising and what is the inflation rate in the US?
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Groceries are among the many items seeing soaring price inflation
Prices across the economy are rising faster than they have done for 40 years.
The increase in the cost of living is putting a squeeze on people's finances, as incomes fail to keep up.
What is inflation?
Inflation is the increase in the price of something over time.
For example, if a slice of pizza costs $1 and that rises by 25 cents compared with a year earlier, then pizza inflation is 25%.
Every month in countries like the US and UK, the government releases a new figure estimating how much prices are rising overall.
Many countries are reporting multi-decade highs, including the US where inflation hit 9.1% in June, the fastest rate since 1981. The inflation rate in August was 8.3%.
The International Monetary Fund expects inflation to reach 6.6% in advanced economies and 9.5% in emerging market and developing economies.
What is causing inflation?
Many things are contributing to the high rate of inflation, including:
Higher gas prices, as oil production lags demand and the war in Ukraine worsens the squeeze.
Rising food prices, after bad weather hurt harvests and the war in Ukraine hit grain production and costs
A surge in car prices, due in part to a supply shortage of microchips that dates to the pandemic
Higher rents and home prices, after low interest rates and remote work turbocharged the property market during the pandemic
And increases in the cost of dozens of other items, including raw materials and furniture, many of which stem from manufacturing and logistics issues related to Covid
In the US, the rise in inflation started during the pandemic, as government spending, including cheques for families, kept demand unusually high. In many other parts of the world, such as Europe, the problem stems from more recent issues, like the war in Ukraine.
Prices for cars - a big part of US inflation calculations - soared last year
How do we measure inflation?
To come up with an inflation figure, government statisticians track the prices of thousands of everyday items. This is known as the "basket of goods".
The basket is updated regularly to reflect changes in what people are buying and differs depending on the country.
For example, in the US, healthcare prices form a much bigger part of the overall calculation than in the UK, where medical bills tend to be a smaller part of people's expenses. By contrast, alcohol prices are weighted more heavily in the UK.
Each month's inflation figure shows how much these prices have risen since the year before. This is known as the Consumer Price Index (CPI).
How has inflation affected pay?
Pay increases haven't kept up with prices, even in countries like the US, where a hot labour market has pushed companies to increase wages.
When inflation is taken into account, the average hourly wage in the US was actually 2.8% lower in August than 12 months earlier. In the UK, pay is falling at its fastest rate since 2001, generating a cost of living crisis.
Joe Biden's popularity has crashed as petrol prices rise
Which countries are seeing the worst inflation?
The rising cost of living is a global phenomenon, as increased energy costs, shortages of goods and materials and the fallout from Covid affect countries around the world.
In recent months, countries with ties to Russia - like Estonia and Lithuania - have been hit particularly hard, a consequence of the war in Ukraine.
Changes to energy price caps are also affecting the rates, as in the UK, where an increase in the cap accounted for almost three quarters of the jump in inflation in April.
Meanwhile, oil producer Saudi Arabia is among the countries with the lowest inflation rates, while in Japan - which has historically struggled with inflation considered too low - it has remained relatively stable.
Higher oil prices have meant rising prices across the global economy
When will inflation come down?
Many economists are hoping that the surge in prices will start to peak by the end of the year, reflecting the impact of central banks raising interest rates.
In the US, central bank policymakers expect inflation to fall below 3% in 2023.
But there are plenty of questions about whether that will happen. Historically, when inflation has risen above 9% it has taken years, not months, to recover.
Why are gas prices falling and will that help fight inflation?
Oil prices have recently fallen as production increases and investors bet an economic slowdown will reduce demand.
For consumers, that often means lower costs at the pump - though how fast gas stations decide to lower prices is typically driven by what kind of local competition they are facing.
If lower energy costs stick around, that should help slow prices increases throughout the economy.
But when economists think about inflation, they often focus less on food and energy prices, which tend to swing frequently. They are looking for a wider slowdown in price increases.
How do higher interest rates fight inflation?
Higher interest rates make it more expensive for businesses and households to borrow, which reduces demand and should, in theory, help to ease the pressures pushing up prices.
However, when inflation is caused by things like rising energy prices worldwide, some worry interest rate rises have more limited power.
Inflation has helped to fuel political unrest in countries including Sri Lanka
What can Joe Biden do to fight inflation?
There are few easy answers for politicians. Economists say price caps, which some countries have implemented, only make the underlying problem worse by subsidising demand. They recommend targeted relief for the worst-off instead.
In the meantime, dissatisfaction over the issue means mounting political unrest around the world.
In Sri Lanka, where inflation is running at more than 50%, the crisis forced the resignation of the former president. Panama has also been home to major demonstrations, while worker strikes have disrupted the economy in Europe and the UK.
In the US, Joe Biden's approval ratings have sunk and his Democratic Party is widely expected to lose the next round of national elections in November.
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