The Real: Excessive fluctuation? Excessive depreciation?
Last week there was a particular strengthening of the dollar against other currencies. The dollar appreciation combined with the domestic risk due to the fiscal and political uncertainties hastened the depreciation of the Brazilian real, which exceeded the level of R$4.00/US$, prompting clamor for the Central Bank to intervene in the forex market. Interventions are welcome when there is excess volatility and/or when the market becomes dysfunctional, but not in response to just any exchange rate movement, less so when the real exchange rate is near its fair value, as is the case now.
Prof. Kenneth Rogoff once said, “exchange rates are naturally born schizophrenics.” The nominal exchange rate (in R$/US$, for example) behaves like a financial asset price, reacting quickly to the differential of interest rates and sovereign risks between the USA and Brazil, however it also has the dimension of a relative price between tradable and non-tradable goods. Since the prices of tradable goods respond almost immediately to the nominal exchange rate while those of non-tradables (among which wages are predominant) are much more rigid, in the short run variations in the nominal exchange rate are transmitted to the real exchange rate, generating a high positive correlation between these two variables. This leads to the illusion that it is only necessary to look at the changes on the nominal exchange rate.
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