Final answer:
The process is known as supranationalism, exemplified by the European Union's efforts to unite economies and create a single market with a common currency, the euro.
Step-by-step explanation:
The process that primarily deals with the vision of building one world unit, a single market entity, is known as supranationalism. This concept is exemplified by the establishment of the European Union (EU), a regional trading agreement that commenced after World War II with the goal of uniting European nations economically to prevent further conflict. The EU aimed to create a single market, introducing a common currency, the euro, removing barriers to the movement of goods, labor, and capital, and fostering closer economic ties between member states. However, the journey to European unification has been complex, with events like Britain's decision to leave the EU, illustrating the challenges of such integration.