Based on a previous idea:

The United Nations, wanting to rid a country of malaria, tries an experiment. Instead of drafting a plan, it sets sells a billion one dollar contracts. Each contract pays out more than one dollar over its term, if and only if malaria is kept to a certain level or lower during that term.

Rather than discuss the problems this plan might have (with finance, governance, etc.), I’ll let you use your imagination to figure out how the free market might find ways around those issues. (This might go on the show.)