Mayor Unterguggenberger introduced a demurrage currency in Wörgl during the great depression before WW2. He "printed" 10000 shilling worth of Arbeitsbestätigungsscheine (work confirmation coupons). The coupons are valid until a certain period, then you have buy a stamp and glue it on. This approximates a -5% interest rate. People didn't hoard the coupons and the town accepted them for tax payments. The town was out of debt within a year and unemployment has shrunk by double digit percentages. The depression was effectively over and all it took was the equivalent of food stamps/unemployment benefits except transferrable between businesses and consumers with a demurrage fee.

The system doesn't have to be adopted by every business or citizen. For instance, 10% of unemployment benefits could be paid out as a demurrage currency with tax acceptance and you would see large scale welfare benefits with almost no burden on the general population. The only burden of this system is juggling two different currencies and an insignificant 5% annual fee on the issued demurrage money supply. If pay out 10% of unemployment benefits or 15 billion dollars it would only cost 750 million dollars in the liquidity fee and that is assuming the money doesn't immediately go back to the government for tax payments at which point the costs keep shrinking and shrinking.