In Guinea, as in many countries, the reference exchange rates published daily by the central bank serve as a common benchmark for various currencies. These rates, often reported in the press and on information websites, provide a general indication of the exchange rates but do not necessarily reflect the actual rates at which transactions are executed. The difference between these two rates constitutes a portion of the cost of a foreign exchange transaction.
The foreign exchange market operates differently from a regulated stock market, where a single, official price is quoted. In the forex market, transactions occur between counterparties, each displaying their own conditions. This leads to several consequences, including the absence of an official price imposed on all participants, different conditions offered to two participants at the same time, and published rates being aggregates calculated according to a defined method.
The central bank publishes a series of daily rates, with their purpose clearly stated. These rates are quoted with the euro as the base currency, and historical series are available. However, the bank has suspended the publication of a reference rate for a particular currency when market conditions did not allow for a representative value to be established. This example highlights that a reference rate only reflects the market under normal functioning conditions.
The data used by national statistical organizations originates from the same source, explaining the coherence between publications. In Guinea, the national institute of statistics obtains its annual series of exchange rates for the euro against major currencies from the European Central Bank. This traceability offers a practical advantage, as historical comparisons based on different sources rely on the same underlying data.
Several elements contribute to the difference between the reference rate and the actual rate applied in a transaction. These include the bid-ask spread quoted by the intermediary, a margin applied to the conversion, the time of the transaction, the size of the transaction, and potential fixed fees. The timing of the transaction is often overlooked, as comparing an end-of-day rate with an earlier reference rate combines two distinct differences: that of timing and that of margin.
The difference between reference rates and actual applied rates manifests in common situations, such as buying securities denominated in another currency, receiving dividends paid in a foreign currency, calculating capital gains on an asset acquired in another currency, and transactions carried out abroad using a card. In the case of calculating capital gains, the conversion must be made at the rate applicable on each transaction date, making the reference rate useful as a justification but not for describing the actual cost incurred.
To measure the actual difference, several checks can be performed, including noting the reference rate on the day of the transaction, comparing it with the rate effectively applied, identifying if the exchange margin is indicated separately or integrated into the rate, and repeating the comparison over several transactions to establish an average. These controls help in understanding the components of the cost and in making informed decisions in foreign exchange transactions.
Key points
- The reference exchange rates published by central banks serve as benchmarks but do not reflect the actual transaction rates.
- The difference between reference rates and actual rates applied can be attributed to several factors including bid-ask spreads, margins, transaction timing, and size.
- Understanding the distinction between these rates is crucial for accurately assessing the cost of foreign exchange transactions.
