Missing in action: Calculating inflation under lockdown

The Covid-19 pandemic has created problems for the statisticians who calculate the rate of inflation.

Chart showing CPI inflation April 2015 - April 2020

Inflation, as measured by the Consumer Prices Index (CPI), fell sharply in April to just 0.9% against 1.5% in the previous month. The main reason for the drop was energy costs:

The sharp moves in energy costs were not the only unusual features of April’s inflation statistics. There was also a serious problem with gathering the data. The Office for National Statistics (ONS) has an annually reviewed ‘shopping basket’ of goods and services which it uses to calculate the various inflation indices. However, for the latest numbers, the ONS discovered about 90 of the items in its basket – about one sixth of the total value – “were unavailable to consumers in the UK”. Haircuts, cinema tickets and a pint in a pub are just some of the many examples. Other items were theoretically available, but in such short supply that the ONS’s price-tracking task more difficult – self-raising flour being a typical problem item. Ultimately the ONS was forced to “impute” (i.e. estimate) some prices.

There is another twist to the price calculation which you may have noticed personally: the pattern of purchases has changed. The ONS basket contains items which can be bought but are just being ignored in lockdown – many travel services fall into this category. For now, at least, the basket is not representative of spending patterns. We may find that creates problems in the long term-, as inflation indices are widely used by government to adjust benefits, prices and tax allowances. Inflation may be under 1% and somewhat distorted at present, but it has not gone away. Some economists fear that it could roar back because of all the borrowed money being pumped into the economy by the government. Others think a recession/depression will keep inflation in check. Either way, it still needs to be part of your financial planning: £1 in April 2015 has only 92p of buying power today.

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