By establishing this link between the levels of cooperation observed in _____ with local forest conditions, rustagi et al. have increased the confidence that scholars can have in the external validity of results from previous experiments carried out all over the world, with student and nonstudent subjects.

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By establishing this link between the levels of cooperation observed in field labs with local forest conditions, rustagi et al. have increased the confidence that scholars can have in the external validity of results from previous experiments carried out all over the world, with student and nonstudent subjects. Field labs are portable labs set up at the place where an experiment will take place. They are easier to set up and tear down than traditional labs.