Charts of the US dollar against the taka look strikingly different from those of most currency pairs. For long stretches during the late 2010s and early 2020s, the exchange rate barely moved, hovering in the mid-80s per dollar while the central bank worked to limit fluctuations. Instead of the jagged lines familiar to analysts of the euro or yen, USD/BDT produced long, flat plateaus punctuated by occasional sudden steps whenever authorities allowed an adjustment. Momentum indicators behave oddly on such data. The relative strength index, designed to compare recent upward and downward price changes, depends on regular movement to generate meaningful readings. When daily changes approach zero, the calculation has little to work with. Under the standard smoothing method developed by J. Welles Wilder, sessions with no change shrink both the average gain and the average loss by the same proportion. When both averages remain positive, their ratio stays the same and the indicator line flattens out at its previous level.
Step adjustments then distort readings in the opposite direction. A single devaluation of several taka, arriving after weeks of stillness, registers as an enormous gain relative to the tiny average losses that preceded it. Indicator values can spike into the 90s almost instantly, suggesting extreme overbought conditions. In a freely traded market, such a reading might be interpreted as a warning of a possible pullback, yet in a managed system the new level frequently holds, because the move reflects a policy decision rather than excess speculative buying.
Experience during 2022 and 2023 illustrated the pattern clearly. Bangladesh Bank allowed a series of adjustments as reserves fell, sometimes moving the rate in sizable increments and at other times holding it steady while pressure built in the kerb market. Technical indicators on public charting platforms could show readings jumping to extremes and then drifting sideways for weeks, offering little guidance about when the next adjustment might come or how large it would be.
Data quality adds a further complication. Price feeds for USD/BDT on international charting services often draw from a limited number of sources, and some display stale quotes or irregular updates. A chart with missing dates or the same exchange rate repeated for several days can give misleading indicator readings. Results may also vary depending on which platform someone uses. One might take its USD/BDT rates from a bank, while another uses a different source. So even when people check the rate on the same day, the indicators on their charts may not match.
Bangladesh now allows the taka’s exchange rate to move within a wider range. There’s been more movement in the currency since then though, albeit not much compared to the big boys. Under the crawling peg, Bangladesh Bank set a reference rate that could be adjusted over time. Banks also gained more freedom to negotiate rates in 2025. That gives the dollar-taka rate more room to move from one day to the next, but the central bank can still intervene. The charts may no longer stay flat for weeks as often as they once did. Even so, a technical indicator showing a sharp rise or fall doesn’t necessarily tell traders where the exchange rate is headed.
Understanding RSI Signals in a Managed Currency Market
The relative strength index is generally measured on a scale from zero to 100. Traders commonly consider readings above 70 as overbought and readings below 30 as oversold. These levels can help identify potential changes in market momentum when prices move through regular buying and selling activity. However, applying the same interpretation to a managed currency requires additional caution. Exchange rate movements may reflect official announcements, adjustments to monetary policy, or changes in foreign currency availability rather than shifts in market sentiment.
For USD/BDT traders, this distinction is particularly important. A sudden increase in the exchange rate does not automatically mean that demand for the dollar has become excessive. It may indicate that authorities have changed the permitted trading level to address economic pressures. Similarly, a period of stable prices does not necessarily indicate that the market has reached a natural balance. It could simply reflect intervention or restrictions that prevent the exchange rate from responding immediately to underlying demand.
Choosing Suitable RSI Settings and Timeframes
The timeframe selected for analysis can also influence how the relative strength index behaves. Daily charts may capture individual exchange rate adjustments, while weekly charts can provide a broader view of longer-term movements. However, neither timeframe can eliminate the limitations associated with irregular price updates. Traders should understand how frequently their chosen data source records actual changes before drawing conclusions from the indicator.
It is also important to avoid relying on a single RSI setting. The standard 14-period calculation is widely used, but shorter periods can make the indicator more sensitive to sudden price changes. Longer periods may smooth out some fluctuations but can also delay signals. Comparing different settings may help analysts understand how sensitive their readings are to individual adjustments. Nevertheless, changing the calculation period cannot compensate for incomplete or unreliable exchange rate data.
Combining Technical Indicators with Economic Information
A more balanced approach involves combining technical analysis with fundamental information. Inflation trends, foreign exchange reserves, export earnings, remittance inflows, and import demand can all influence the taka’s performance against the US dollar. These factors help explain why the exchange rate may experience pressure even when technical charts show limited movement. Monitoring policy announcements and banking regulations can also help analysts understand whether a sudden adjustment is likely to represent a lasting change or a temporary market response.
Analysts studying the taka can also examine other evidence. Reserve figures, remittance flows, import payments, the gap between official and kerb rates, and statements from the central bank can provide important context that an oscillator alone cannot capture. The relative strength index remains a useful tool on liquid, freely traded pairs, and its behavior on USD/BDT offers a clear demonstration of how indicators built for open markets can lose their meaning when policy rather than trading activity sets the price.