German trade union Verdi has called on retail workers across the country to walk off the job on Friday. “This is just the first of several strike and action highlights in the coming weeks,” the union announced on Thursday. The current round of collective bargaining in the retail sector has been going on for months. Numerous strikes, for example directly before Christmas, were unable to change the deadlocked situation. So far, the industrial action has had little impact on customers because participation has been relatively low. The union is demanding at least €2.50 ($2.70) more per hour in all…