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The currency is currently trading at 1.0721 versus the euro. Two years ago, the bank upended currency markets by suddenly scrapping its limit on the franc.
"I have great confidence in the SNB and its policies," Johann Schneider-Ammann said in Saturday's Neue Zuercher Zeitung newspaper.
"The SNB is not infallible, but it is independent and is aware of its responsibilities," he added. "It operates with a great deal of sensitivity and skill."
Schneider-Ammann said a euro-franc exchange rate of around 1.15 would be tolerable for most Swiss business, and would allow long-term investments to be made.
Swiss companies had coped better than expected with the stronger currency, he said, although there could be long-term consequences, he said.
"The longer that business, above all SMEs, sacrifice their profit margins to stay in the market, the less are they able to invest and innovate.
"Because the investment ability of some SMEs has suffered, the full effect of the currency shock has been delayed."
(Reporting by John Revill; editing by Andrew Roche)
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)