The values in our charts in these pages are in nominal taka: they are the actual amounts reported to us by the Diarists. This has the advantage of being reliable, but the disadvantage of not reflecting inflation. But rural Bangladesh has suffered from inflation and therefore the numbers we show, such as income and savings, do not reflect how their 'real' value has declined over the years.
For example, Diarist 13's gross income as seen in chart 01 seems to have grown noticeably over the years. We have therefore produced chart 05. which shows his monthly net income (all income less business costs) in both nominal and inflation-adjusted terms.
We have added trend lines to even out the ups and downs, from which it is apparent that Diarist 13's monthly net income has indeed grown over the years, but by much less than the nominal figures suggest. From a base of around 7,000 taka a month in autumn 2015 nominal net income has climbed to over 20,000 taka by autumn 2024, but its real value has grown to around 13,000 taka (at 2025 prices).
Those pay rises he had had recently for his work at the tea stall were sorely needed.
The inflation data come from the Bangladesh Bureau of Statistics and Bangladesh Bank. Their reliability is debated, especially after the recent change of government. Reportedly, interference in the reporting of such numbers has been detected.