How Inflation Is Measured, and Why It Feels Different at Home

When the official inflation figure is announced, many Filipinos compare it with their own experience at the palengke, the gas station or the sari-sari store, and find that the two do not always match. The number may say prices are rising slowly, while a family's grocery budget seems to stretch less every week. Both can be true at the same time, and understanding why starts with how inflation is measured.

The consumer price index

In the Philippines, the Philippine Statistics Authority compiles the consumer price index, or CPI. The CPI tracks the prices of a fixed basket of goods and services meant to represent what a typical household buys: food, non-alcoholic beverages, housing and utilities, transport, health, education, clothing, communication and more.

Each item in the basket is given a weight based on how much of household spending it usually takes up, drawn from surveys of family income and expenditure. Food carries a large weight because it accounts for a big share of spending for many Filipino households. Prices are collected regularly from markets and outlets across the country, and the index is compared with the same month a year earlier to produce the headline inflation rate.

Statisticians periodically update the base year and the weights so the basket keeps reflecting how people actually spend. Regional and provincial figures are also published, since price movements in one part of the country can differ sharply from another.

Headline and core inflation

Headline inflation covers the full basket. Core inflation strips out items whose prices tend to swing sharply for reasons outside normal demand, such as certain food items and energy. Economists watch core inflation because it gives a clearer picture of underlying price pressures, while headline inflation reflects what households actually pay overall.

The Bangko Sentral ng Pilipinas uses these measures in setting monetary policy. It adjusts its key policy interest rate with the aim of keeping inflation within a target range, which for many years has been set at 2 to 4 percent. Higher rates tend to cool borrowing and spending, while lower rates tend to encourage them.

Why your inflation is different

The official rate is an average across many households, places and products. Your personal inflation depends on what is in your own basket. Several factors explain the gap:

• Spending mix: a household that spends most of its income on food will feel rising rice or vegetable prices more strongly than the average.

• Location: prices, and how fast they change, vary between cities, provinces and islands.

• Frequency: people notice prices they pay daily, like fares and food, more than items bought rarely, even if those rarely bought items get cheaper.

• Memory: shoppers often compare today's prices with what they remember from years ago, while the headline rate compares with only a year earlier.

There is also a common confusion between the inflation rate and the price level. When inflation slows, prices are still rising, only more slowly. Prices rarely return to earlier levels, so a slowdown in inflation does not feel like relief if incomes have not caught up.

When inflation slows, prices are still rising, only more slowly.

Making the number useful

The official figure is still valuable. It informs interest rate decisions, wage discussions, business pricing and government planning. For households, the most useful approach is to treat it as a reference point rather than a verdict on their own budget. Tracking regular spending on a few key items, such as rice, cooking fuel, transport and utilities, can give a clearer sense of personal inflation and help with planning.

Inflation is ultimately about purchasing power: what a peso earned today can buy compared with before. Reading the official number alongside one's own experience gives a fuller picture than either can alone.