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A South African cold drink manufacturer experiences an increase in production costs due to higher electricity tariffs and transport costs. Quantity of cold drinks supplied per week before and after the increase in production costs, by price: R7: 140 before, 130 after; R6: 120 before, 110 after; R5: 100 before, 90 after; R4: 80 before, 70 after; R3: 60 before, 50 after; R2: 40 before, 30 after; R1: 20 before, 10 after. At a price of R5 per cold drink, what is the effect of the increase in production costs on supply?