Do some similar type of jobs during work days never attract me. Always do the same thing makes people feel bored. For example, when you do some calculating, and the more you calculate the more money you will get. Will you choose to do one type of calculating or do different types? Certainly, you will do only one type. My uncle is managing a factory, the factory mainly produces different kinds of winter clothes. They pay workers salary by the number of clothes they produce. So workers certainly want to do only one types of work. Because they can get more pay.

If workers do different kinds of job every day, they will spend a lot of time in learning the making methods. And the factory will not produce enough product for its customers. When the number of the product decreases for a long time. The Factory‘s partner will change another factory to produce the product. So, the partner's change another factory will cause the old factory's workers to have nothing to do in a long time. The salary will decrease. Even workers will get unemployed.

 As for workers salary is crucial