在中国的计划生育政策的光照下，中国家庭中大部分都只有一个孩子。因此，中国的父母给所有的爱，只有一个，由于中国传统文化，留下所有的财富，只有一个。在中国的社会问题上，流行的词都是“富二代”和“富三大”，都是躺在父母的财富上睡不好觉，没有工作，没有压力。他们的职责是享受生活，并从父母或家庭中传递财富。在解决这个问题的解决方案中，社会团体可以帮助唯一的一个社会问题。原因是他们可以解决这个问题上的孤独。大多数人都拥挤在一起讨论，分享意见和一起玩。在计划生育政策问题的目的上，他们希望通过社会合作活动，帮助朋友在社会上与朋友分享社会合作活动。在合作的过程中，只有通过社会活动来克服他们的道德问题，在社会中。 Suppose Haier, the successful Chinese fridge manufacturer, sells its fridges through many different retailers in Hong Kong. Explain how a resale-price-maintenance (RPM) clause between Haier and its retailers would improve efficiency.
In economy, in the upper reaches of the market operators tend to limit the downstream market operators resale price. The manufacturer of a product often requires its dealers cannot sell below a certain price. Otherwise, dealers will sell low-cost to grab market share, and using the puerile way to earn more revenue. When dealers sell at low prices, retailers will have greater leeway to low-cost retail. The ultimate beneficiaries must be the consumer. However, this price competition between dealersis not what the manufacturer would like to see. Because once the price of a product habitually runs at low price in the market, the expected consumer price will be habitually reduced. This would allow manufacturers to lose the basis of its high-priced running. After the price war, dealers, often requiring manufacturers to lower ex-factory price, so that the dealers themselves to earn more money, thereby further weakening the manufacturer's profit margin. Thus, manufacturers tend to limit auto resale prices or minimum sale price, so that manufacturers, distributors, retailers operate on a fixed, orderly price.
 Describe how tie-in (the old-fashioned IBM computers + IBM punch cards) may have helped IBM price discriminate their customers. How would such a practice enhance social welfare? (Hints: Refer back to Chapter 16 of the book entitled ``Law's Order''.)
Tie in is to promote a product by selling with another product by using its label, packaging or other carriers. It markets through the distribution channels of the product itself. It comes with advertising messages to reach precise target audience. The biggest difference with tie in marketing and other marketing approach is that is does not rely on any such advertising newspapers, radio, television, Internet or other third-party media. It almost does not consume any additional energy, or need to establish specialized distribution channels. It will not cause any environmental pollution, and even improve the environment. Moreover, since the user with a marketing potential users and carriers of goods are highly consistent, this symbiotic media marketing model sales for the two commodities have a very effective role in promoting.Therefore, it is win-win to both sellers and consumers.(责任编辑：anne)