Big money international investors are in the opposite situation though. They usually have to convert whatever they hold back into dollars or another major currency, meaning they see a huge fall in value.
MSCI's dollar-denominated index of Turkish shares, for example, slumped 9% during Tuesday's brutal lira rout, by which time it was down 20% this month and 30% since the start of the year.
The currency slide - triggered by an unorthodox policy promoted by President Tayyip Erdogan of slashing interest rates, in the hope of boosting the economy and jobs, while inflation hovers near 20% - has at least left Turkish shares historically cheap and for some investors, a useful hedge against losses elsewhere.
"The main reason for all-time highs in lira terms is the sharp (lira) depreciation ... and ... exporting companies' spectacular stock returns," said Doruk Ozaner, fund manager at Istanbul Portfoy.
"When we look at the stock market in dollar terms (it) is very cheap historically," Ozaner added.
Refinitv IBES data shows the MSCI Turkey Index’s dollar-denominated price-earnings (PE) ratio now stands at 5.4, well below its equivalent for emerging market peers at nearly 13.
Many Turkish exporters are benefiting from the lira's slump coupled with the world economy's bounceback this year from the initial COVID-19 shock. Isdemir reported that third-quarter net profit leapt 657% from a year earlier to 3 billion lira ($242.09 million), while Sisecam's third-quarter profit of 1.35 billion lira beat expectations by 6.5%.
It hasn't gone unnoticed. Foreign investors bought $384 million worth of Turkish stocks in the seven days ending Nov. 19, after recording their biggest weekly inflow in a year with $480 million as of Nov. 12, according to central bank data. Total net transactions of foreign investors stood at $1.14 billion in the first three weeks of the month.
"Since foreign investors are getting cheap lira in the swap market, they borrow and take positions in the market. I believe, the central bank won't hike rates and will continue with rate cuts. This is the new Turkish economic model; high inflation, high (dollar/lira) levels, low interest rates," Ozaner said.
The damage done by more than a decade of lira weakness - Turkey's currency has nosedived nearly 90% since 2011 - is clearly evident though.
Bank for International Settlements data shows that nearly 20% of Turkish companies' revenues were being used just to make interest payments at the end of March. Back in 2011 it was just 7.4%.
For dollar-based international investors, MSCI's Turkey index is also exactly where it was after the major lira crisis in 2018 when worries about overborrowing and poor relations with the then Donald Trump-led U.S. government hit hard.
MSCI's main world share index which includes 50 countries is up 50% over that same period.
Emerging markets strategist at SEB, Per Hammarlund, thinks caution is therefore still required, especially if the currency crisis escalates, triggering emergency rate hikes or even capital controls which would prevent investors getting their money out.
"At that stage the stock market would look overvalued even if it looks cheap now," said Hammarlund. "This economic experiment is bound to fail I think."
Canan Sevgili and Berna Suleymanoglu
(Reporting by Berna Suleymanoglu, Canan Sevgili and Halilcan Soran; Additional reporting by Marc Jones in London; Editing by Jonathan Spicer and Susan Fenton) ((firstname.lastname@example.org;))