Without Government intervention businesses may neglect the needs of certain stakeholders. e.g.
Damage Environment
Exploit consumers by charging high prices
Exploit workers by paying low wages
Therefore Government intervention may be required. As always in economics there are advantages and disadvantages to intervention. If there is too much intervention job creation and investment may fall and MNCs make look elsewhere to locate. Too little intervention and some stakeholders may suffer.
Government Policies to increase competition
Encourage the growth of small firms
Lower Barriers to entry
Introduce legislation to reduce anti-competitive behaviour.
Limit Monopoly power
Preventing mergers/acquisitions that create a monopoly
Protect Consumer interests