Disinflation

The Bank of England, the UK central bank, distinguishes Disinflation from a sustained, broad decline in prices. Think of a car that slows down but keeps moving forward: lower speed does not take it back to its starting point. Similarly, lower positive inflation still pushes the price level up. One negative monthly reading alone does not establish persistent deflation; another index or period may show something different. Even the retreat of Hyperinflation, exceptionally rapid price growth, does not automatically restore old prices. Monetary Deflation, a shrinking money supply, is related too. But money quantities and prices are different variables whose changes cannot be treated as interchangeable. [1]

Start with a basket costing 100. A 10 % increase takes it to 110. Next year, growth slows to 4 %, but applies to the higher price: 110 × 1.04 = 114.4. Inflation has fallen, yet the price has not dropped to 104 or back to 100. The basket now costs 14.4 % more than at the start. This is our illustrative model, not a country’s data. It explains why someone can welcome lower inflation while still feeling their budget squeezed. If their income has not risen meanwhile, slower price increases alone do not restore the basket’s lost affordability. [1]

In our example inflation moves from 10 % to 4 %. The difference is 6 percentage points. Measured against the initial inflation rate, however, the decline is 60 %. Both statements are correct, but neither says shop prices fell by that amount. The International Monetary Fund (IMF) describes inflation as the change in an index for a defined shopping basket. It helps to separate the basket’s price, its rate of change and the change in that rate. When a headline says inflation has fallen sharply, first establish which variable it compares and over what period. [2]

A year-on-year figure compares today with the same month a year earlier. The European Central Bank (ECB) explains how an unusual price movement back then can strongly affect the change in this figure. In our model the basket’s index starts at 100 and reaches 120 the next month. In months 12 and 13 it is unchanged at 126. Yet annual growth falls from 26 % to 5 %, because the second comparison starts from a higher base a year earlier. Prices have not fallen between the last two months. This base effect is a feature of comparison, not statistical deception. Recent monthly changes therefore help interpret the annual figure. [3]

The overall index combines goods and services with different weights, their shares in the result. Cheaper energy can pull overall inflation down while services still rise strongly. Alongside the total, the ECB therefore examines components and core inflation, here excluding energy and food. Other measures may exclude different items. Core inflation is not a particular family’s receipt: that family still pays for energy and food. One favourable reading also does not establish a lasting, evenly spread easing of prices. We need to know what the index covers, its weights and how often it is measured. [4]

Disinflation can follow restored supplies and cheaper inputs, or weaker demand after borrowing becomes more expensive. The first route eases production; the second can dampen investment, output and employment. The ECB’s account of monetary policy examines how interest rates affect demand and business decisions. Effects also take time to work through. Do not infer a recession or an automatic rate cut from the word disinflation alone. Nor does a chart of Monetary Base, cash and the balances banks hold in accounts at the central bank, reveal the cause by itself. Assessment requires evidence on production, credit, wages and other price pressures. [4]

Interest is about more than the money credited: Purchasing Power means how much that money buys. The ECB therefore distinguishes the nominal contractual rate from the real rate after allowing for inflation. With a nominal 5 % and expected inflation of 4 %, the expected real rate is roughly 1 %. If expected inflation falls to 2 %, the approximate result rises to 3 % despite an unchanged contract. The exact ratio calculation gives about 0.96 % and 2.94 %; simple subtraction is an approximation. Expected inflation belongs in a forward-looking assessment, while measured inflation belongs in a retrospective one. These perspectives can produce different results. [5]

Bitcoin.org explains the price of bitcoin (BTC) through supply and demand. News of slowing inflation can change expectations for interest rates, income, credit or investors’ willingness to take risks. But the market may have anticipated the news and priced it in already. The reason for the slowdown matters too: better supplies are not the same as collapsing demand. Disinflation alone therefore does not guarantee that BTC will rise. It helps explain the setting in which people make decisions rather than predict a single outcome. Reading a price chart requires expectations and other events alongside the published number. [6]