*4.3. Proposer Behavior in the Ultimatum Game*

*Result 2: Reflective subjects offer less in the ultimatum game than intuitive subjects.*

*Reflective* subjects offer on average less than those not *reflective* (average offer of DKK 40.9 and DKK 50.5, respectively). This difference is statistically significant (*p* = 0.0001, MWU).

The average offer in the *ultimatum game* was DKK 43.5. The most frequently offered amount was DKK 50, which 68.6% of the subjects chose.

Of the *reflective* subjects, 15.7% offered DKK 10. Only one subject (1.8%) from the *intuitive* group offered DKK 10.

Distinguishing whether the *recipient* accepts or rejects an offer when indifferent, both offers of DKK 0 and DKK 10 can be considered consistent with rational and strictly self-interested behavior. 16.9% of the *reflective* subjects chose either of these offers as opposed to 3.1% of the *non-reflective*. This difference is statistically significant (*<sup>p</sup>* <sup>=</sup> 0.005, *<sup>χ</sup>*<sup>2</sup> <sup>−</sup> *test*).

When controlling for gender, *reflective* subjects are estimated to be 12.6%-points more likely than *non-reflective* subjects to offer DKK 0 or DKK 10 in the *ultimatum game*. *Reflective* subjects are predicted to choose such an offer with a probability of 16.2% as opposed to a predicted probability of 3.6% for those *non-reflective* (see Table 1).
