Lending without interest in a Jewish state
Yehezkael, R. 2002.  BH 13:203-206. CELD ID 21443

There were years in Israel (1980-1985) when prices increased by 25 percent every month or two, and penalty interest rates reached about 1760 percent per annum. I clearly remember seeing a sign on a shop selling car accessories warning "deferred payments bear interest of 4 percent a day."