one of germany’s most prominent economists is urging the european central bank to be more transparent in outlining its exit from unprecedented monetary stimulus and argues that ruling out an end to negative interest rates next year may be a mistake volker wieland a member of the government’s council of economic advisers said he questions whether forecasts showing inflation around 2 in the longer term are still in line with a deposit rate of 05 to enhance clarity the ecb should consider making interestrate projections similar to those published by the federal reserve