Study Bjornskov (2006): study ZZ 1990

Public:

18+ aged, general public, 80 nations, 1990-2001

Sample:

Respondents:

N = 800000

Non Response:

Assessment:

Interview: face-to-face

Correlate

Authors's label

Trade openness

Our Classification

Operationalization

Trade-volume as % of GDP

Observed Relation with Happiness