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FRANKFURT, Germany (AP) -- The European Central Bank says banks under its jurisdiction appear well-prepared to face unexpectedly higher interest rates.

The ECB's banking supervision division released results Monday of a stress test that showed suddenly rising rates would increase net interest income, an important part of bank finances.

Earnings at some banks have lagged due to the current very low interest rate environment that squeezes the margins between rates at which banks borrow and their lending rates.

The central bank said that in a hypothetical interest rate shock involving an increase of 2 percentage points, net interest income would increase by 4.1 percent this year and 10.5 percent next. The stress test imagined a sudden overnight increase. That is a highly unlikely scenario, but one which helps show whether bank finances are robust.

The ECB concluded that "interest rate risk is well managed by most European banks."

It warned however that many banks are relying on questionable models to predict how their deposit customers might behave. The models were mostly constructed based on the years since 2008, which means they are based on experience only from a period of falling rates. Deposits are usually one of the most stable sources of money for banks, and a sudden decision by lots of people to take their money elsewhere could hurt bank finances. The ECB said it would engage banks in discussion about their models.

The study showed that banks would show losses in the economic value of their equity, another financial category.

The ECB's bank supervision division is kept separate from its monetary policy duties, so the stress test doesn't provide any hints about the bank's thinking on the future course of its rate policy.

Currently, the bank is contemplating phasing out its stimulus program over the course of next year. The bank has been buying 60 billion euros ($70 billion) of bonds a month in the hope of keeping market interest rates low, thereby helping to stimulate the economy and get inflation up to its goal of just under 2 percent. The bank has said it does not plan to raise its benchmark interest rate from the current zero until well after the bond purchases end, which would mean not until 2019 at the earliest.

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