Eggs, large free range, per dozen priced in Bitcoin: 2015 to 2021

Eggs, large free range, per dozen (per dozen) cost £2.78 in 2015 and £2.13 in 2021, a change of −23% in pounds across 6 years. The figures are annual averages from ONS, RPI: Ave price - Eggs: Large, free range, per dozen (series J9DM). The fiat peak in this series came in 2015 at £2.78.

Priced in sats, the same item went from 1,535,912 sats to 6,130 sats, a change of −99.6%. The conversion uses the yearly average BTC price for each matching year, never a rate from a different era. The least flattering single step for the sats series was 2018 to 2019, when this item moved −13% in sats terms. Short windows can and do run against the holder; the direction across the full series is what the chart shows.

This series was retired by the ONS in early 2022, so the window shown is shorter than the rest of the page. Within it, eggs actually got cheaper in pounds: supermarket price wars did what they do. In sats the fall is of a different order entirely.

One grocery line proves nothing on its own. Repeated across the whole basket on the main page, the pattern stops looking like noise and starts looking like a property of the unit of account.