Is it good for the peasants to make a living in the cities?

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Nowadays, more and more young men from countries are coming to the cities to earn money in China. I think it's quiet a common phenomenon. I also think these young people should not be encouraged to flock into cities. In many villages, only the old and children are left, even the young women have gone to the cities. Agriculture in a nation is very important, its output backs up to the whole country's economy. If we want to develop the economy, we must pay attention to the agriculture. In addition, whether those young people could make better living in cities is still in doubt. Perhaps making a living in cities is not the only way for them to live better. BTW, how could these peasants find a job in the city and protect their own right from being violated? Maybe before they decide to go to the city, they should consult the local employment agencies. With the accurate information, they can find a job more easily. Also, they should be skilled in a certain field. In order to protect their rights, they should sign a contract with the employers. It's also essential to get a job via legal employment agencies. But most of the peasants didn't accept high education and don't have any skill and they even don't know the labor laws. There are data shows that the crime rate is increasing with the growing of the number of peasants in cities. So, do you think it's good for the peasants to make a living in the cities?