Start with "the boba that got more expensive"
Three years ago the bubble tea you drank all the time cost 15 yuan; today the same cup is 18 yuan. Same cup, more money out of your pocket.
Look at it another way: back then 100 yuan bought about 6–7 cups, now it only buys a little over 5. You don't have less money—your money just buys less.
This ability—"how much stuff the same money can buy"—is called purchasing power. When prices rise across the board, purchasing power falls.
What actually counts as "inflation"
Note: one or two things getting pricier is not inflation. When vegetables spike after a typhoon, that's just one item briefly in short supply.
Inflation means the prices of most goods and services rising broadly and persistently over a stretch of time. Food, clothes, transit, haircuts… nearly everything slowly getting more expensive—that's when it counts.
Why a little bit of inflation is actually normal
Rising prices sound bad, but most economies don't aim for "zero increases"—they aim for mild, predictable, modest rises (think on the order of a few percent a year).
One reason: if everyone expected things to be cheaper tomorrow, they'd put off spending as much as possible, factories couldn't sell, and layoffs would follow—which is worse. A little inflation keeps the economy "turning over."
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The CPI (Consumer Price Index) that the statistics bureau publishes every month measures the overall change in the prices of a whole basket of goods and services. Why does it use a "basket" rather than tracking just one or two items?
答案：Because inflation is about prices moving "broadly," and watching just one or two items can mislead you with isolated swings
Correct: inflation stresses "broadly," and a basket filters out the chance swings of a single item to reflect the overall trend. The tempting-but-wrong option is the third—treating vegetable prices as a stand-in for all prices is exactly the "single item ≠ inflation" trap; vegetable prices are heavily disturbed by weather and seasons, so on their own they're the least representative of the whole.
Around 2010 a single Beijing subway ride cost 2 yuan; today it's commonly 3–7 yuan, while over the same period a typical monthly salary went from a few thousand to over ten thousand. If you look only at "the subway went from 2 to 5 yuan," which inference is correct?
答案：You can't directly conclude the subway got "more expensive"—you have to see how much income and overall prices rose over the same period
Correct: purchasing power is "how much the same money buys," so you must compare the fare increase against income and overall prices; looking at the nominal price alone leads to a misjudgment. The second option is tempting but wrong—a 1.5x fare rise doesn't equal a 1.5x drop in purchasing power; they aren't the same thing. The third treats a single item's price rise as inflation, exactly the trap this lesson keeps stressing.
Among the following four situations, which one is least likely to count as "inflation"?
答案：Affected by international developments, only cooking oil—one single item—climbs for months on end, while other prices stay basically stable
Correct: cooking oil rises "persistently" but not "broadly"—it's just a supply shock to a single item and doesn't count as inflation. The first option, even though a few things are falling, can still constitute inflation because "nearly everything is broadly rising" (inflation doesn't require every single item to rise—look at the whole). The third and fourth are inflation's standard manifestation and its equivalent definition, respectively. The key here is that the "broadly" condition isn't met, not whether "anything is rising."
Japan was long stuck in a state where prices didn't rise—or even fell—and its economy stayed sluggish for years; that's why many central banks would rather set a mild inflation target of around 2% a year. Which option best explains "why falling prices are feared"?
答案：Expecting things to keep getting cheaper, people delay spending, businesses can't sell, and may cut output and lay off workers—a vicious cycle
Correct: persistent deflation makes people keep waiting for cheaper → demand shrinks → output cuts and layoffs, which is exactly why mild inflation is treated as "normal." The fourth option is a swap-with-an-adjacent-concept trap—deflation in itself is not directly the same as hyperinflation; the harm of falling prices runs through the "demand shrinks" chain, not by "turning into" hyperinflation; the other two are mechanisms made up out of thin air.
True or false: In some country one year, prices rose about 50,000% year over year, the currency turned into near-worthless paper almost overnight, and people rushed to convert their wages into physical goods the same day. Since "mild inflation is normal," this situation should also be regarded as a healthy, normal economic phenomenon.
答案：False
False: this lesson's conclusion is that only "mild and stable" inflation is normal—the key qualifier is "mild." A 50,000% annual rise is runaway hyperinflation (as seen in Zimbabwe and Venezuela), which makes savings evaporate fast and is precisely dangerous, not normal. Extending "inflation is normal" to any magnitude—without the "mild" qualifier—is a textbook overgeneralization.
Suppose inflation one year is about 3%, and you lock 100,000 yuan in cash in a drawer for a full year (not spending a cent, not earning a cent). What happens to this money after a year?
答案：The figure is still 100,000, but it buys about 3% less stuff—your purchasing power quietly shrinks
Correct: inflation doesn't touch the number in your wallet—it changes what those numbers can be exchanged for, which is exactly "the ruler getting shorter." The second and fourth options mistake "falling purchasing power" for "a change in the paper amount" (the figure on the banknotes doesn't grow or shrink on its own); the third assumes "not spending means no effect," but as long as prices are rising, idle cash is diluted by inflation all the same.