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Journal of Economic Interaction and Coordination

Erschienen in:

16.09.2016 | Regular Article

The effect of communication channels on promise-making and promise-keeping: experimental evidence

verfasst von: Julian Conrads, Tommaso Reggiani

Erschienen in: Journal of Economic Interaction and Coordination | Ausgabe 3/2017

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Abstract

In modern organizations, new communication channels are reshaping the way in which people get in touch, interact and cooperate. This paper, adopting an experimental economics framework, investigates the effect of different communication channels on promise-making and promise-keeping in an organizational context. Inspired by Ellingsen and Johannesson (Econ J 114:397–420, 2004), five experimental treatments differ with respect to the communication channel employed to solicit a promise of cooperation, i.e., face-to-face, phone call, chat room, and two different sorts of computer-mediated communication. The more direct and synchronous (face-to-face, phone, chat room) the interpersonal interaction is, the higher the propensity of an agent to make a promise. Treatment effects, however, vanish if we then look at the actual promise-keeping rates across treatments, as more indirect channels (computer-mediated) do not perform statistically worse than the direct and synchronous channels.

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The same paper has informed the most recent experimental research on promises, such as Charness and Dufwenberg (2006), Vanberg (2008), and more recently Ma et al. (2015).

Balliet (2010) provides a meta study on the effects of communication on social dilemmas. The author finds large positive effects of communication on cooperation, which is moderated by the type of communication, i.e., face-to-face communication has a stronger effect compared to written messages.

Chat room-based communication tools are increasingly diffusing into large business organization (e.g., Slack or Chatter; The Economist 2016a, b). We thank an anonymous referee for having directed our attention to this emerging phenomenon.

This treatment reproduces either a freelance working relationship or interaction with a colleague within the firm who is located in an overseas office.

E.g., Ellingsen and Johannesson (2004), Charness and Dufwenberg (2006) and Vanberg (2008).

See Branas Garza (2007) and Berger et al. (2011) on helping behavior at the workplace.

The topic of the survey was about the individual perception of different NGOs in terms of trust and reputation. The content of the survey was not announced during the promise-making phase.

Like in the PC-Lab treatment subjects (i) first engage in the unrelated task, (ii) the outcome/payment is communicated, and finally (iii) the promise-making task is administrated.

This is a key technical feature of the “elfe” laboratory of the University of Duisburg-Essen. For this reason this venue is well suited to host studies focusing on communication channels.

In treatment PC-Online, subjects were informed that they would receive an email containing an URL link to get to the survey platform (see Script. A.1 in the “Appendix”). In this case, the following wording was adopted “[...] If you promise to participate, within 5 min you will receive a voucher via email with the link to access to the survey”.

Note that the same female research assistant (24 years old) was intentionally chosen to communicate with the subjects because the experimenters, males and above the age of a typical university student, might bias subjects’ actions due to obedience or authority concerns; see Karakostas and Zizzo (2016). During the experimental sessions the subjects did not encounter any other research assistants or experimenters. In order to control for gender-related effects (Solnick and Schweitzer 1999; Eckel and Grossman 2001), in each treatment almost 1/2 of the subjects were males and 1/2 were females (see Table A.4).

The sender was the academic society HEIRS—Happiness, Economics and Interpersonal Relations; University of Milan-Bicocca < http://www.heirs.it/ \({>}{<}\) info@heirs.it \({>}\). This scientific society has no connection with the University of Duisburg-Essen. The subject of the email was: “online survey access link.”

In order to minimize subjects’ transaction costs, we provided shortened URLs (e.g., http://goo.gl/s3aCrd) that are quick and easy to type in all different internet browsers. This is also to keep the setting as constant as possible compared to the PC-Online treatment, where subjects received an already active URL link in the body of the emailed voucher, and they just needed to click on it in order to get access to the survey (see Script A.1). Table A.5 reports how the promptness in fulfilling the promise was not different under the alternative experimental conditions. In all the treatments, subjects took on average 6 h and 30 min before filling the survey. This result provides evidence about the fact that receiving an already “active link” (PC-Online treatment) does not represent and advantage in terms of promise-keeping.

We monitored the activity on the online survey platform both before and after the provided 24 h time window. No one visited the survey platform before the actual start (1 h buffer time after promise-making). The survey platform was monitored during the subsequent 2 days, no one filled in the survey after the deadline.

We thank an anonymous referee for his/her advice on this point.

See Frank (1988).

The Jonckheere–Terpstra test is a non-parametric test for more than two independent samples, similar to the Kruskal–Wallis test. Unlike Kruskal–Wallis, Jonckheere–Terpstra tests for ordered differences between treatments, and hence it requires an ordinal ranking of the test variable. For a more detailed description of the test, see Hollander et al. (2015).

The coefficients for PC-Lab and PC-Online (both asynchronous channels) turn to be not statistically different from each other (Wald-test \(p=0.509\)).

It is the number of reported tails in the coin flip task by Conrads and Lotz (2015). In this experimental task, subjects had to privately flip a coin four times. Each time tails was reported, a subject earned 1 Euro in addition to a fixed payment of 7 Euros for filling in a socio-demographic questionnaire. Thus, subjects had an incentive to over-report the true outcome of the four coin flips. The independent variable labeled ‘Reported outcome’ in Tables 3 and A.5 captures the payoffs earned by subjects in the previous experimental task (this control variable varies between 0 and 4). ‘Reported outcome’ can be interpreted both as behavioral outcome and, as a consequence, payoff earned in Conrads and Lotz (2015) task, e.g., if a subject reported tails four times she would also earn 4 Euros.

We thank an anonymous referee for this remark (see also Footnote 11).

No subject started the survey without fully completing it. No one accessed the survey platform before the starting time or after the deadline.

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Titel: The effect of communication channels on promise-making and promise-keeping: experimental evidence
verfasst von: Julian Conrads
Tommaso Reggiani
Publikationsdatum: 16.09.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Journal of Economic Interaction and Coordination / Ausgabe 3/2017
Print ISSN: 1860-711X
Elektronische ISSN: 1860-7128
DOI: https://doi.org/10.1007/s11403-016-0177-9

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