PRA's Pillar 2A consultation may point way ahead for AMA

Hanoi at the turn of the twentieth century: facing an infestation of sewer rats, the colonial government put a bounty on the heads (or, in fact, the tails) of the pests. Rat catchers throughout Hanoi were paid for every rat's tail they brought in. But, puzzlingly, the steady increase in bounty paid was not matched by any decrease in rats.

In a stroke of entrepreneurial genius, the rat catchers had realised it made more financial sense to breed the rats and then cut off their tails, leaving the