The economic situation in Turkey has been a powder keg for months, and it’s finally found a spark.

While investors have never truly trusted Turkish President Recep Tayyip Erdogan, he’s shredded his last vestiges of credibility in recent months by appointing his son-in-law as the country’s finance minister and espousing his belief that lower interest rates were needed to fight inflation, the exact opposite of economic orthodoxy (and your humble author would argue, all the empirical evidence of centuries of central banking); indeed, Erdogan recently “interest rates are the mother and father of all evil.”

At first glance, Turkey’s economy appears to be doing alright. After all, the country’s GDP grew by 7% in 2017 and appears on track to match that growth this year. The issue, as hinted above, is that inflation is running rampant at about 16%. With price pressures running hot, traders had expected the Central Bank of the Republic of Turkey (CBRT) to hike interest rates from their current 17.75% level in last month’s meeting. In defiance of investors’ and economists’ expectations, the CBRT instead held interest rates steady, sparking a selloff in the Turkish lira (TRY).

That selloff has turned into a rout this week after the US threatened (and has now instituted) punishing sanctions on senior Turkish ministers, as well as this morning’s announcement of steep tariffs on metals. The ferocity of the selloff in the lira is a true rarity among developed countries: Turkey’s currency has fallen by a staggering 16% today, 25% this week, and 42% year-to-date against the US dollar! With emotions ruling the market and volatility in the stratosphere, there’s no telling how far the currency could fall in the coming days and weeks.

Reminiscent of the European debt crisis of 2010 and 2011, investors are now turning their attention to the next domino to fall. According to the ECB, there are three European banks with heavy exposure to Turkey (BBVA, Unicredit, and BNP), and all of them are selling off sharply as a result.