Educational guide
Inflation and real returns in BDT
Separate a nominal change in money from a change in purchasing power using a transparent example.
A nominal return describes how an amount of money changed before adjusting for inflation. A real return estimates the change in purchasing power. One common one-period approximation is real return = (1 + nominal return) / (1 + inflation rate) − 1. The result depends on the period and inflation measure; it does not account for every household's personal cost changes.
A fictional calculation
If a hypothetical deposit grows by 8% over one period while the chosen inflation measure is 6%, the exact real return is (1.08 / 1.06) − 1, or about 1.89% for that period. Subtracting 6 from 8 gives a 2 percentage-point approximation. Both calculations omit tax, fees and any mismatch between the measured price basket and a household's actual spending.
Use the right inflation series
Bangladesh Bureau of Statistics publishes CPI and inflation material, including revisions and rebasing. When calculating a past period, use the series and dates that match that period and note revisions; do not combine a current monthly rate with a multi-year nominal return. A national CPI is a broad measure, not an exact personal inflation rate.
Compare like with like
Match the return period, inflation period and compounding convention. For multi-year purchasing power, compound inflation over the same horizon rather than multiplying a single month's rate by years. If a product's taxes, charges or withdrawal conditions apply, include them separately using verified terms. No current inflation or yield figure is asserted here.