approving or blocking mergers . Competition regulating authorities and other actuators of anti-trust law intend to prevent market failure caused by cartel , oligopoly , monopoly , or other forms of market dominance . http://en.wikipedia.org/wiki/Small_but_Significant_and_Non-transitory_Increase_in_Price *** Anti-competitive practices Monopolization Collusion Formation of cartels Price fixing Bid rigging Product bundling and tying