Answer:
In 1903, the modern part of Hanoi was struck with beubonic' plague. The large sewers in the modem part of Hanoi were an ideal and protected breeding ground for rats. The sewers allowed the rats to move easily around the city and they began to enter well-cared homes of the French through sewage pipes.
To prevent the invasion a rat hunt started. The French used Vietnamese workers for this and paid them for each rat they killed. Since the rats had to be caught in thousands, the whole situation was going out of hand.
Since this dirty work was to be done only by the Vietnamese, they began collective bargaining. Another innovative method they took was they clipped only the tail of the rat to show as proof of killing and released the rat. So the process could be repeated.
Some people began to raise rats to make money. Failing miserably in preventing the menace the French had to scrap the whole programme.
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