Answer:
Vietnamese, who did this dirty work of entering sewers,
found that if they come together they could negotiate a higher bounty. They
also discovered innovative ways to profit from this situation. The bounty was
paid when a tail was given as a proof that a rat had been killed. Clipping of
tails led to the releasing of rats after that and that process could be
repeated over and over again. The expenditure of the French became too high and
the number of rats also did not reduce, so they decided to scrap the bounty
programme.
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