BRAZIL and Russia, the third- and fourth-biggest emerging economies, have much in common beyond their size. Each boasts annual GDP per person of around $ 10,000, which depends more than either would like on natural riches. After commodity prices tumbled in 2014, their economies shrank and their currencies sank. Their central banks have fought hard against the ensuing inflation, driving it below 3%. That has allowed both to cut interest rates, contributing to modest economic recoveries.
But their fiscal fortunes have diverged. Brazil’s credit rating was cut by Fitch on February 18th, making its sovereign bonds even “junkier” (ie, more speculative). Russia’s rating, by contrast, was raised a few days later by S&P Global, which became the second agency to rate Russian sovereign debt as “investment grade”.
That might seem an odd description for a country embroiled in two wars and encumbered by sanctions. But Russia’s upgrade is not hard to justify. Though its approach to geopolitics is adventurous, its approach to…