Union Verdi is preparing more strikes to step up pressure on Amazon in Germany, its biggest market outside the United States, in a dispute over pay and conditions, German media reported. Workers at Amazon centers in Bad Hersfeld and Leipzig will walk out for at least one day on Monday, Heiner Reimann of Verdi told daily Stuttgarter Nachrichten. The union has organized several short strikes this year in a bid to force the worlds biggest Internet retailer to accept a collective agreement on employment conditions similar to deals for the mail order and retail sector, which are more generous than for the logistics sector. Amazon regards staff in Bad Hersfeld and Leipzig as logistics workers and says they receive above-average pay by the standards of that industry.