Experimental Design
We conduct randomized information manipulations, exploiting a 2-by-2 factorial design.
First, we have two conditions regarding the sender of the messages on self-restraint behaviors. Specifically, we consider the political authority (the current prime minister) and the current Emperor as the ones who send messages. Since there is already a flood of administrative messages on staying home at the time of the experiment, we consider the condition of the political authority to be our control group. In Japan, the Imperial Family is well-respected and is supposed to be the ``symbol" of Japan. As such, even without any political power with him, the Emperor can influence the society with his messages. Therefore, we will treat this condition as our treatment, and test the symbolic power of the Royals.
In both cases, the senders of messages hope that the society will overcome the COVID-19 pandemic. For the sake of the salience of the experiment, we choose actual statements made by either sender before our experiment set off, rather than we make up fictional messages. Those messages come with drawing images of the senders in order to enhance the reality of the messages.
Next, we have two conditions regarding personalized messages. If participants are in ``NO" condition, they will receive some common information for everybody, just as it is happening in the real world. Instead, if participants are in ``Yes" condition, they will receive personalized messages. Those personalized messages contain information of their own hours of outings from the previous week, together with the median value of outing hours for the rest of participants. As such, from the messages it is easy for our participants to grasp where they stand in the distributions of outing hours. The aim of our personalized massages is to make the information in the society more salient to individuals, thereby promoting responsible behaviors on their own.