The freedom movement of people is by far the most disputed (tranh chấp) of the 4 freedoms, fears of increasing unemployment, downward pressure on wages and so-called welfare tourism, especially following the enlargement of 2004 and 2007, were heard in many of the old member states, public sector jobs can be restricted to nations.

Mostly for work purpose, is very important concept for EU, but one which raises nationalistic passions and issues which are treating to break the union.

It remained difficult for non-resident EU citizen to open a bank account in an other EU country.

The freedom of movement of capital enables capitals to move freely within the EU other than tax-related restrictions. The single curency Euro) makes it easier to move capital around.

The bloc is made up of multitude of nationalities with their own language and dialects and this natural barriers keeps the steady of goods and services from being effective.

This introduces a natural implicit barriers to the single market which is language

The freedom of provision of services is fraught with implicit barriers, namely due to the imposition of warrants and constrain on the mutual recognition of qualifications achieved by nationals of other nationalities.

Labelling is another implicit barriers, with some government still imposing certain regulations which may be deemed as a barrier. Ex: Buying medicines from certain countries a local doctor's written recommendation and one from the patient's country won't do.

All the product in the EU must achieve the CEI marks, which is established according to specific rules and regulations and delegated to national authorities in each member state.

Eliminate all barriers such as customs: This is most liberalised (Tự do hoá). No members state has imposed any long term tariffs, customs duties, quotas or other explicit barriers for any goods from one EU country to another.

Optimum allocation of resource: Resource in the market are better distributed and allocated. Since consumers are willing to pay for a certain quantity of a product, producers are willing to pay to acquire raw materials, otherwise, producers produce too much of a good that no one wants. Its also encourages firms to be more efficient as thay seek to produce at the lowest price possible to maximise their profit.

Motivation influence of free enterprise: Guided by invisible hand, entrepreneurs take a risk to fulfill consumer demand. Those entrepreneurs who succeed are rewarded with profits (The invisible hand is an economic concept where market demand act as signals for producers). Ex: Because consumers want and willing to pay for bread, a baker has the incentive to produce bread.

Absent of bureaucracy: Free market reduce cost, lead to more innovation and R&D through the absence of red tape (quan liêu). Entrepreneurs don't have to wait for the government to tell them what to make. They study demand, research trends and meet the customer's needs through innovation. This also encourages competition amongst firms to improve their product and services.

Consumer sovereignty (Chủ quyền): In a free market, producers produce what consumers ưant at a reasonable price. It gives the customer more choice for their purchases.

Unemployment: Certain members of society will not be able to work with the elderly or the unemployed (because their skills aren't marketable). They will be left and will fail into poverty (remember if there is no government they can not be helped)

Firm power: Large firms can still dominant certain markets, even where there is competition and exploit suppliers (by squeezing their prices down) and consumers (by charging higher selling prices) to maximise profits. Amazon has done this in the book industry by dictating unfair terms to publishers.

Merit goods: Goods and Services that are not profitable will not be produced/run. Rural communities will suffer as a result. Ex: regarding transport and post for example, rural hospital may not be profitable to run but are necessary.

Poor Quality: Since profit maximisation is the biggest motivation for firms, they may try to reduce their costs, unethically by polluting the environment or by exploiting workers.