What happened

Shares of Argentine bank Grupo Financiero Galicia S.A. (NASDAQ:GGAL) are down 13.5% as of 1:05 p.m. EDT, and for at least a couple of good reasons.

This morning, analysts at Citigroup announced they're downgrading the company's shares from "buy" to "neutral." Also this morning, Argentina's central bank announced it is hiking interest rates to 60% -- a one-third increase from the previous 45% rate -- in an attempt to attract more investors to its currency, and halt the devaluation of the Argentine peso.

A masonry wall reading BANK

This bank looks pretty sturdy. Citigroup thinks GFG, on the other hand, is anything but. Image source: Getty Images.

So what

One side effect of raising interest rates is to increase the cost of borrowing, which one would expect to hurt profit at a bank like Grupo Financiero Galicia S.A. For foreign investors in the company's stock, the continual decline in value of the Argentine peso, when translated into U.S. dollar terms to determine whether profits or growing or shrinking, may pose an additional concern.

Now what

Already, the Argentine peso has lost nearly half its value over the past year, so some might say that the damage here has already been done. The decision to downgrade Grupo Financiero Galicia stock after the interest rate hike, however, suggests that Citibank, at least, thinks there may be more bad news to come.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.