Anarchism is not idealistic it is materialistic based on the concrete analysis of how capitalism works. The richest 3 men own more than the 48 poorest countries. Ireland, in the middle of an economic boom, has the 2nd highest percentage of people living in absolute poverty in the Western world. This is a fundamental property of capitalism - the vast majority of property is owned by a tiny minority of the population, the ruling class. The majority of the people, the working class, are compelled to rent their labour to a boss who uses their labour to create profits for herself.
Capitalist companies are institutions which exist in order to maximise their profits.
This means that they will attempt to create a situation where they can pay their workers as little wages as possible in return for as much work as possible. When the bosses talk about 'productivity', 'partnership' and 'flexibility', what they actually mean is, more work for less pay. Clearly this partnership effectively means that the bosses reap the vast majority of the benefits of the economic boom. The exploitation of the workers does not stop there. It is the workers, not the bosses who pay the great majority of the tax to finance the state.