set sales

I passed the shop of their own integration, the use of set sales of such goods processing and sales, the shop business is better than before a lot, now in is filled with this business model can be seen, but Iis still not able to understand the centralized sales approach to the set the sales of such goods, I can not explore its Why would such an effect, of course, is not that we should know something, if we can make good use of this one way, then goodin this way to expand their profits like the other does not matter.