Martin Wolf, Chief Economic Commentator of the Financial Times, examines how policymakers are testing the norms of economic life as they seek solutions to slow growth. The payment of interest goes back to the Babylonians. Today, the business of banking is based on paying savers and charging borrowers for money. Negative interest rates, paying banks for holding our funds, violates this established norm. Yet, five central banks, which together oversee a quarter of the world's economy, have opted t...
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