The lira dropped to over 4.80 per dollar on Wednesday, down some 5 percent since Tuesday.
The Turkish Central Bank is under pressure to hold an emergency meeting to sharply increase rates before a scheduled monetary policy meeting on June 7, but is seen to be reluctant as President Recep Tayyip Erdogan wants rates low. Higher rates can support a currency and ease inflation, but also hinder economic growth by making borrowing more expensive.
The lira has lost more than 20 percent of its value against the dollar since the start of the year. The risk is that will increase the price of imports, making Turkish people effectively poorer. It could also encourage more investors to pull their money out if they expect that the value of their investments to drop as the currency declines.
Turkey's market jitters in part reflect a global trend in which the currencies of emerging economies have come under pressure. Economists say that is partly because the U.S. Federal Reserve is raising interest rates, encouraging investors to place their money in the U.S. instead of other economies.
Because Turkey is particularly dependent on foreign capital, its markets are one of those to have suffered most. Other countries that have seen sharp drops in their currencies include Brazil and Argentina.
But Turkey's currency is under particularly heavy pressure because of the complicated political backdrop. While a central bank is in theory independent from the government, Erdogan has put pressure on it to not raise rates as he prepares for early presidential and parliamentary elections next month.