The idea of creating a customs union between Estonia and Latvia, two linguistically different but economically and culturally similar countries, was seen in the 1920s–1930s as a very bold experiment.
Ideed luua tolliliit küll kahe eri keelt kõneleva, kuid majanduslikult ja kultuuriliselt sarnase riigi vahel, nagu seda olid Eesti ja Läti, hinnati 1920.–1930. aastatel erakordselt julgeks.