The demand for 1,000-franc notes has risen in the past months, data from the Swiss National Bank (SNB) indicates.
CHF1,000 converts to approximately €925.75, £824,63 or $US1126.98.
Whether withdrawing the money from an ATM machine or directly from a bank, customers request large-bill denominations more often than before.
“We do know there is more cash being currently withdrawn in large notes, but it changes hands less often” Sarah Lein, a monetary policy expert from the University of Basel told SRF public broadcaster.
This means the money is not being spent but stashed away.
“We can conclude that some large notes end up in a safe”, she added.
The reason, she said, is that many banks charge their customers negative interests on large deposits.
“Therefore, it could be cheaper to simply withdraw the cash in large notes and keep it in a safe, especially since inflation has been extremely low for a long time”, Lein added.
This is not unusual — in times of crisis, more cash is often in demand.
But could this cause the shortage of 1,000-franc bills?
That is not likely to happen, Lein pointed out.
“Both the central and commercial banks have enough cash stored in their vaults to meet such demand. So there is always enough money available”, she said.
There is about 48.6 billion francs floating around in the form of 1,000-franc notes, constituting 59 percent of all Swiss notes in circulation.
It is the world’s second-largest denomination after Brunei's B$10,000 note.