This doctoral thesis discusses temporary movements of service providers in the EU Internal Market. Movements such as posting of workers of cross-border movements of self-employed persons constitute one of the pillars of freedom to provide services. As granted by the Treaty on functioning of the European Union, businesses may temporarily conduct entrepreneurial activities in another EU Member State without being established there. Typical cases include installation of equipment purchased by a resident of another EU country, short-term construction works, trainings of personnel in foreign companies etc. Posted workers remain employed by a company in their country of origin and do not seek access to labour markets in the host state. Self-employed persons run their business activities based on a trade license issued in the country of origin and do not set up a business in the country of destination. Nevertheless, in contrast to freedom of establishment, such activities need to be of a temporary -- not repeating, irregular, not continuous - character. In practice, this definition is rather vague and there is no clear frontier between temporary movements and freedom of establishment. Temporary character of postings raises the question how to obtain statistics on numbers of persons providing services through temporary movements or volume of corresponding services. Given the level of integration, there are no statistics based on traditional movements' observing such as visa or work permits. Lack of information about providers' flows may lead to difficulties in estimating the impact of related barriers as well as benefits from further liberalization. The Services Directive 2006/123/EC is the most recent norm regulating provision of services in the Internal Market. Since the final version does not contain the most progressive provisions such as country of origin principle, we may examine whether it is targeted at barriers faced by the businesses during temporary movements. Taking in account all above mentioned topics, this thesis provides complex multi-disciplinary analysis of conditions for provision of services with temporary movements of natural persons in the Internal Market. In particular, it tests following hypotheses: 1. Due to depth of integration and subsequent abolition of visa and work permit requirements; there is a lack of statistical resources on provision of services with temporary movements of natural persons. With existing tools, reliable statistics cannot be obtained. 2. Lack of statistical data on temporary movements prevents us from quantifying impacts of remaining barriers to temporary postings. 3. Nevertheless, there is evidence on persisting discriminatory barriers to postings by most vulnerable businesses - Small and Medium Enterprises (SMEs). 4. The implementation of Services Directive in its final version has only a limited impact on elimination of barriers which hinder temporary postings by SMEs. The first and second hypotheses were rejected, hypothesis three and four confirmed. Movement of providers, as well as its impact on labour markets of host countries may be estimated via E 101 or A 1 forms issued by national social security authorities. Subsequently, indices of restrictiveness may be constructed following to data collection at national levels or databases. Data mining from SME feedback database proved that Member States still maintain barriers such as license requirements, work permit requirements or lengthy procedures on recognition of qualifications. During the reference period 2006-9 the SMEs mostly complained about problems related to value-added tax, qualification issues or labour law provisions applicable on postings of workers. Such areas are, however, exempt form the scope of the Services Directive. Given the complexity of analysis, findings of this thesis may be used both in practice and academic field.

服務貿易「模式四」涉及生產要素之一的勞動力跨境移動，其所能帶來之貿易利得相當可觀；然而，勞動力之移動向來不為地主國青睞，各國針對此等自然人服務提供者多所管制，造成模式四貿易之諸多障礙，致使模式四佔服務貿易總量之比例極低，而亟待開發。在盤點多邊與非多邊體制下WTO之GATS與TPP協定消弭模式四貿易障礙之成果後，本文發現，國際間對於模式四貿易障礙之消弭必須持續推動，方能早日獲致模式四貿易自由化附隨之經濟利益。奠基於上述多邊與非多邊體制之成果，本文提出未來國際間在持續消弭模式四貿易障礙之可行方向，並以現正如火如荼談判中之「服務貿易協定（TiSA）」為例，印證本文所建議之方向有其可行性。 / Mode 4 of trade in services entails the cross border movement of one of the factors of production: labor. The potential gains from labor mobility can be substantial; however, labor mobility has never been welcome. Numerous regulations imposed by the receiving countries on the natural persons as service suppliers create barriers to the Mode 4 trade, resulting in the fact that Mode 4 trade accounts for little proportion of all four modes of service supply. After conducting stock takes on the elimination results of Mode 4 trade barriers through the GATS and the TPP Agreement respectively under multilateral and non-multilateral trade regimes, this article argues that efforts to remove Mode 4 trade impediments should continue in order that the ensuing welfare gains from Mode 4 trade liberalization can ultimately be achieved. Based on the aforementioned elimination results under both multilateral and non-multilateral regimes, this article proposes several approaches to further elimination of Mode 4 trade barriers, taking the ongoing Trade in Services Agreement (TiSA) as an example to verify the feasibility of the proposed approaches.