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The distribution of facilities is closely related to our social economic activities. Recent studies have reported a scaling relation between population and facility density with the exponent depending on the type of facility. In this paper, we show that generally this exponent is not universal for a specific type of facility. Instead by using Chinese data we find that it increases with Per Capital GDP. Thus our observed scaling law is actually a mixture of some multi-scaling relations. This result indicates that facilities may change their public or commercial attributes according to the outside environment. We argue that this phenomenon results from the unbalanced regional economic level and suggest a modification for previous model by introducing consuming capacity. The modified model reproduces most of our observed properties.

In In recent years, new virtual currency which is born on the Internet, has attracted more and more attention. Especially represented by the bitcoin, which is decentralized and has limited amount, has become active in the global market. Digital storage, decentralization, limited amount, complete anonymity and confidentiality, all make the strong monetary attribute. However, whether bitcoin, whose nickname is gold 2.0, could complete monetary attribute, and whether it could perfect the monetary functions, need to be researched and demonstrated. In addition, the public awareness of bitcoin isn't much. They don't realize the superiority and the shortcomings of bitcoin. In this paper, we start from the introduction of bitcoin, discuss the monetary attribute in detail, and analyze the problems and challenges which bitcoin faces. At last, make a summary, and discuss the meaning and the future.

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