We ask a representative sample of German household decision-makers to enter their mother's birthday, with potential payments depending on the month and the day they state. Thus, we create an incentive to lie. Compared to the die-under-the-cup experiment, our alternative has a lower probability that the income-maximizing outcome is true. Furthermore, it is better suited for online surveys and samples in which gambling is socially stigmatized. We conduct different variations of this game to crystalize design recommendations for researchers interested in our tool. Participants lied to receive higher payoffs, but only with real monetary incentives and only to a relatively small extent. Our results are largely insensitive to several design elements that we vary, such as the probability of being paid and the magnitude of the payoffs.

中文翻译：

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你会在你母亲的生日上撒谎吗？一项新的在线不诚实实验

我们要求德国家庭决策者的代表性样本输入他们母亲的生日，潜在的付款取决于他们所说的月份和日期。因此，我们创造了说谎的动机。与杯下骰子实验相比，我们的替代方案实现收入最大化结果的概率较低。此外，它更适合赌博受到社会污名的在线调查和样本。我们对该游戏进行了不同的变体，以便为对我们的工具感兴趣的研究人员提供具体的设计建议。参与者撒谎是为了获得更高的回报，但只有真正的金钱激励，而且程度相对较小。我们的结果很大程度上对我们改变的几个设计元素不敏感，例如获得报酬的概率和回报的大小。