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Risk perception and WTP for health-risk reductions. Histograms showing (a) the perceived risk from blooms of toxic cyanobacteria in Loch Leven (1 = no risk; 10 = very high risk) and (b) the distribution of WTP bids in relation to a reduction in the number of days on which toxic cyanobacteria present risks to human health in Loch Leven from 90 (status quo) to either 45 or zero days risk.
