Seeking IMF Aid Brings Argentina Relief—And Political Challenges

President Macri’s decision signals the government will speed up unpopular austerity measures

BUENOS AIRES—Argentine President Mauricio Macri’s decision to turn to the International Monetary Fund has likely bought the country some time to stabilize a growing financial crisis. But the move also comes with a large political cost for Mr. Macri by tying the economy to an institution that is widely disliked here.

Argentine stock prices rose 4% on Wednesday, a welcome relief rally for investors who have watched the country’s stocks, currency and bonds dive since the end of April, though the dollar was up 1.4% against the...