How the IMF SDR Currency Basket Weights Are Determined
Summary
This note outlines the factors said to inform the currencies and weights in the International Monetary Fund's Special Drawing Rights basket. The answer describes the SDR primarily as a unit of account for the IMF and related institutions, rather than as a trading instrument intended to move foreign-exchange markets. Currency eligibility is associated with liquidity and transferability, while weight-setting is linked to a country's IMF quota, its importance in global trade, and the currency's role in international capital flows.
The answer says the basket weights remain fixed during a five-year review period, so they do not automatically adjust to market movements during a crisis. It presents the criteria as a broad explanation and acknowledges that the full scoring method may not be public. As a result, it does not provide a reproducible formula for calculating exact weights, and the description should not be treated as a trading signal or a complete account of the IMF's official methodology.
Key ideas
- The SDR is described chiefly as an IMF unit of account, not as a trading instrument.
- Currency liquidity and transferability inform inclusion in the basket.
- IMF quota, global trade importance, and capital-flow use are described as weight factors.
- Basket weights are fixed between periodic reviews rather than continuously marked to market.
- The explanation does not give a complete formula for reproducing the weights.
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Full text
# What determined the weights of a currency in the International Monetary Fund SDR basket(2015)? # What determined the weights of a currency in the International Monetary Fund SDR basket(2015)? I am assuming that the weights of currency in the SDR were establishedby following a transparent process. Are these weights the result of a vote or is there a mathematical algorithm/formula that generated the following weights: U.S. Dollar 41.73 Euro 30.93 Chinese Yuan 10.92 Japanese Yen 8.33 Pound Sterling 8.09 ? ## Answer by demully (score 3) https://quant.stackexchange.com/a/60640 It's a unit of account (for the IMF and other international bodies') purposes. As well as just a basket of the most liquid and transferable currencies that reserve managers will all hold anyway in their normal course of business. It doesn't "move" FX markets. The measures as I understand them are: = basic liquidity and transferability (which is why there are only 4/5 in the basket in the first place). - a country's IMF "quota", ie a country's shareholding in the IMF - a country's trade intensity (ie their currency matters from a global trade perspective) - a currency's intensity in global capital flows. The last two reflecting the likelihood that economic changes could generate global capital and FX shifts that would cause FX reserve managers to shift reserve allocations. But the weights themselves are fixed for the 5 year rolling review period, so the SDR doesn't "mark-to-market" in a crisis. The idea is that the currencies included are those with the least chance of an Emerging Market-style currency crisis in the first place! I'm not sure the precise scorecard is published in full; but its basic purpose is a unit of account rather than a trading instrument. And any counterparty of the IMF who wished to trade it with them, could and does trade exactly what they wanted in real time with the banks, exactly how they wanted, rather than through the SDR basket.
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