It is simply not true that corporations are necessary to conduct business (as some below have suggested). A business owner does not have to incorporate in order to hire employees and sell products. All that incorporation does is grant a business privileged protection by the state (limited liability, mainly, but also tax advantages). The argument for having corporations is the same as for any other government exercise of power: "it is good for society." The extent of influence and power that the largest corporations exert today makes them effectively "anti-business," because they wield the power of government to make it impossible for new and/or smaller businesses to enter the market and compete with them.
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