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1 From one-time basal application of PR. 2 Private and environmental benefits are discounted by 10 and 3 , respectively. 3 Based on 3 discount rate. 4 Most profitable alternate product is included here. 5 Discount rates range between 5 and 15 for private benefits and between 1 and 5 for total benefits. 6 Phosphate rock concentrate. Source World Bank, 1997.