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There is something of a quasi-experiment here, though.
This is a quasi-experiment; see an earlier posting for a discussion of this mode of reasoning.
Research design To answer the research question about the effect of media exposure on political interest, a longitudinal quasi-experiment is devised.
The difference is however that people are not randomly assigned to the different treatments; therefore the term quasi-experiment is used and the research is an observational study.
Skilled Emigration and Skill Creation: A quasi-experiment - Working Paper 152
"quasi-experiment" - research that uses a random element found in data to duplicate the structure of a laboratory trial.