Many of the microstates have also entered into a customs union with their larger neighbours to improve their economic situation (Vatican City and San Marino with Italy, Liechtenstein with Switzerland, Monaco with France).
Velik broj mikrodržava ulazi sa svojim susjedima u carinsku uniju kako bi poboljšale svoju ekonomsku situaciju: Vatikan i San Marino s Italijom; Liechtenstein s Švicarskom; Monako s Francuskom.