The vaisyas are meant for producing agricultural products, trading them and distributing them. And the working class, or sudras, are those who haven't the intelligence of the brahmanas or the ksatriyas or the vaisyas, and therefore they are meant to help these higher classes by bodily labor. In this way, there is full cooperation and spiritual advancement amongst all the different orders of society. And when there is no such cooperation, the members of society will fall down. That is the present position in the kali-yuga, this age of quarrel. Nobody is doing his duty, and everyone is simply puffed-up by calling himself a brahmana (intellectual) or a ksatriya (soldier or statesman). But actually, such people are without status. They are out of touch with the Supreme Personality of Godhead because they are not Krsna conscious. Therefore the Krsna consciousness movement is intended to set the whole of human society in proper condition so that everyone will be happy and take profit from developing Krsna consciousness.   (More...)