哈尔弗得通过计算得出结论：消费者在咖啡馆中为所饮咖啡支付的额外花费，流向生产者的仅有10%。
Mr Harford calculates that only 10% of the premium paid for Fairtrade coffee in a coffee bar trickles down to the producer.
哈尔弗得通过计算得出结论：消费者在咖啡馆中为所饮咖啡支付的额外花费，流向生产者的仅有10%。
Mr Harford calculates that only 10% of the premium paid for Fairtrade coffee in a coffee bar trickles down to the producer.
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