Yes thats according to what is thaught in high school economics,
and is drummed into people day in day out.
What if interest was the main cause of inflation?
What if interest is responsible for cyclical unemployment and the boom bust cycle?
There is an alternative to the fractional reserve system,
the government it self could take back the right to issue currency, instead
of the central bank.
Ill give you one modern day example.
The Island of guernsey one of the channel islands of Britian, has had
interest free money issued by the government since 1815, and now has better living standards for its 60,000 people than switzerland, where once it was the poorest part of britian.
Ironically one can argue that Guernsey has the only "Islamic"
financial system in the world.
that should ruffle some saudi feathers.
Economists who have been advocating this are starting from Proudhorn in 19th century france to Argentine/German Silvio gesell and American Irving Fisher of the 1920's.
John Maynard keynes lent support to Gessel in his works and Keynes is as mainstream as you get.
The best example though is from the belgian economist and one of the architects of the Euro, Bernad Lietaer. check out his book "Beyond Scarcity".