Indeed, if the abstraction charge is set below KRW 2000 per cubic metre, then users in the vulnerable region will abstract too much water (because the price is too low for them to get the right signal) and water resources will be overexploited. But if the abstraction charge is set at KRW 2000 per cubic metre for everyone, users in the less vulnerable region will reduce their consumption below the optimal level (since they will pay a too high price for water). This could result in a loss in welfare for households and a loss in value added for industrial and agricultural users.