Since all of these terms serves its meaning in the context of the mechanism where the company plays its market power.As it gives the platform of monopoly power.

Monopoly power provides the structure of the market where a firm uses its market share and dominate the same in lieu of it so that it could generate more profit as it has too many alternatives to do the same that is reducing the supply, sets the higher prices and so on.?

Now, the rule of reason provides the criteria of evaluation where the legal authorities make checkout on the increasing span of monopoly power of a firm so that the firm would not make anti-competition effects and exploit the market. If it is over the limits, then the legal authorities would prohibit the same. Price discrimination serves the situation where the different prices would exist for the different sets of consumers. And the Network effect serves the situation where the more use of the product makes the more value of the product. All of these mechanisms serve a realistic approach to the world.

For example, the mobile company gets increased its value among the consumers because of its increasing technology span and new features. Due to the network effect as more value of the product provides the more share of power of the market. As a result, due to the increasing preferences of the consumer for the products produced by a firm, a firm would get some market power which would give an access towards price discrimination in which a firm could charge the different price from the different consumers so that it could make authority in the market to grab more market power and eliminate the competition. And then rule of reason comes in the picture where there will be the evaluation of the market power of a company and legal actions would be imposed if the market power is large enough to hamper the competitive environment, then this market power would be prohibited by levying the imposition of fines, penalties and so on.