Final answer:
An economic union requires political unity, regional development, and taxation.
Step-by-step explanation:
An economic union requires some level of political unity. This means that member countries must give up some of their political autonomy and agree to coordinate their policies and decisions.
In addition to political unity, an economic union may also involve regional development, where resources and investments are allocated to promote overall growth and development within the union.
Furthermore, an economic union may require taxation policies to be harmonized to ensure a fair and equitable distribution of funds and resources among member countries.