Turkey's currency plunges to new low
The tariffs themselves are minor and impact around $1 billion (€880 million) in trade, but they weighed on market confidence in the vulnerable Turkish economy.

"Their currency, the Turkish lira, slides rapidly downward against our very strong dollar," Trump wrote on Twitter. "Our relations with Turkey are not good at this time."

The continued imprisonment of US pastor Andrew Brunson has weighed heavily on relations between the United States and Turkey, leading to a series of escalations. Ties between the two NATO allies have also nosedived over American support for Syrian Kurdish forces, Ankara's plans to buy a Russian missile system and Turkey's demand that Washington extradite US-based Islamic cleric Fethullah Gulen, who Erdogan blames for the failed July 2016 coup attempt. There is also an impending showdown in November over US sanctions on Iran, a major oil and gas supplier to Turkey.

More than US-Turkish tensions

While souring relations between the Washington and Ankara have added to Turkey's economic woes, they are only a proximate cause of the market mayhem.

Observers have seen a vulnerable economy for months, something that has been exacerbated by political developments and Erdogan's government.

Umit Akcay, a professor of economics at the Berlin School of Economics and Law, wrote on Twiiter: "The warnings we have issued for months are unfortunately happening. Turkey is experiencing a currency crisis. We are entering a very difficult period. The government is responsible."

Turkey has traditionally suffered from yawning current account deficits, which it has filled through external borrowing in foreign currency. Driven by a search for higher yields, external funds entered the Turkish economy to finance deficits, massive government spending and company borrowing. Credit-fueled growth, especially in the construction sector, helped the Turkish economy grow.

However, investors have pulled back money from the Turkish market in recent months as the US Federal Reserve raises interest rates and cuts back on asset holdings from quantitative easing in response to a robust  American economy.

This has caused the dollar to increase in value, the lira to lose value and Turkish bond yields to rise. Meanwhile, inflation has jumped to over 15 percent, reaching a 14-year high.

The lira sell-off has raised concerns that Turkish firms and banks that took out loans in dollars and euros will be unable to repay their debts after years of borrowing. The currency crisis is turning into a debt and liquidity crisis.

"Turkey is threatened by a financial crisis, whereby loans are not repaid, companies file for bankruptcy and this then hits the banks. We are heading in this direction,"  Turkish economist Korkut Boratav told DW.

Erdogan's unorthodox economic policy

The pressure on Turkey is reflective of broader trends in emerging market currencies, although the lira is by far the worst performer.

That's because investors have lost confidence in the Turkish economy under Erdogan, who believes in unorthodox economic policy, demands low interest rates and constantly assails "the interest rate lobby."

After winning a June election that cemented expanded presidential powers, Erdogan spooked markets when he tightened his control over the central bank.

Instead of appointing technocrats like Mehmet Simsek, the former finance and economy minister, in whom international investors had faith, Erdogan appointed his son-in-law Berat Albayrak to lead the newly empowered Finance Ministry. This has raised concerns over the central bank's independence.

 Türkei, Istanbul: Finanzminister Berat Albayrak hält Ansprache (picture-alliance/M. Alkac)
Social media was poking fun at Albayrak as he sweat his way through an economic policy speech on Friday

Erdogan has not inspired confidence in responding to the economic meltdown. He and some of his ministers are speaking of "economic war" and a vague "campaign" waged by nefarious external powers designed to weaken Turkey.

On Friday, he again urged Turks to exchange their gold and dollars for lira. That call came as Albayrak delivered a much-touted economic plan which fell flat and failed to address the current economic crisis.

Timothy Ash, an economist covering emerging markets, commented on Twitter that Turkey needs to act quick instead of suggesting that the country can wait until the next monetary meeting in September.

"Turkey - reflecting on the Albayrak performance today he gave zero indication of actual policy. And he expects the market to wait till September until the MTP. That is miles away. Turkey needs policy ACTION now if it is going to manage thru this," he wrote.

Instead of taking quick and drastic action to shore up confidence, such as by raising interest rates or going to the International Monetary Fund (IMF), the government is couching itself in nationalistic rhetoric of sacrifice and an escalating war of words.

On Thursday, Erdogan told supporters: "Various plots are ongoing. Don't pay attention to these campaigns. They have the dollar, (but) we have our people … and Allah."