Abstract
We examine how rewards and penalties under tournament incentives impact price behaviour in experimental asset markets. Adding a penalty to a reward-only contract, or a reward to a penalty-only contract, changes the traders’ behaviour. The experimental markets with adjusted contracts experience less trading, but longer-lived and larger bubbles. This observed effect of penalties is consistent with herd-driven behaviour under relative performance evaluation, while the effect of rewards reflects the influence of the convexity of bonuses. However, these effects dissipate with trader experience. Our findings contribute to the debate attributing market instability to incentive structures in the finance industry.
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Notes
To further highlight the difference, Kleinlercher et al. (2014) point out that it is possible under their bonus compensation contract for all traders to receive a bonus, since with a favourable dividend outcome, all traders could exceed the benchmark-level of cash. In the absence of collusion, this is not possible in tournament schemes where bonuses are paid for above-average performance, since someone must perform below average.
A screenshot of the trading interface can be found in Online Resource 1.
These dividend structures mimic that of Ackert et al. (2006), who also use a standard/lottery-asset dichotomy, though theirs has a much more pronounced difference in potential payoffs between the two types. This difference is intentional, as we wanted participants to view Asset Y as a viable “investment” rather than a purely speculative bet.
The expected value of the total future dividend stream was common knowledge, and was communicated to all participants in the form of an “average holding value” table in the written instructions.
To prevent the other features of the graph from being obscured, the step function corresponding to the maximum cumulative dividends for asset Y (black dashed line) is only partially displayed.
In periods where there was no trade in an asset, the median transaction price was replaced by the median buy offer for that asset in the period. This was done to avoid misleading fluctuations in the Account Total, and participants were made aware of this before the market began.
To ensure consistency with the procedures used in the existing literature, the written protocol was adapted from Dufwenberg et al. (2005), Noussair et al. (2001), Noussair and Powell (2010), Lugovskyy et al. (2009), Childs and Mestelman (2006), and Cheung and Coleman (2014). Participants were also given time to read the instructions on their own, and to ask any clarifying questions privately (which were also answered privately). The written protocol is reproduced in Online Resource 1, which can be obtained from the authors.
The survey can be found in Online Resource 2, which is available from authors.
This is a modified version of the end-of-experiment questionnaire used by Ackert and Church (2001).
The evolution of median transaction prices in each individual market of the Linear, Carrot, CarrStick, and Stick treatment can be found in Online Resource 3, which can be obtained from the authors.
Unlike Fisher and Kelly (2000), we report the median of the Prediction Errors across all sessions/markets rather than the average, due to the lower sensitivity of the median to outliers in small samples.
The behaviour of Prediction Error in the individual markets of the Linear, Carrot, CarrStick, and Stick treatments can be seen in Online Resource 3, which can be obtained from the authors.
The bubble measure values observed in the individual markets of each treatment are tabled in Online Resource 4, which can be obtained from the authors.
The CRT/DOSPERT data was collected after the market, hence it is possible that traders’ market experiences influenced their responses. However, random assignment of participants to treatments should ensure that the treatment groups are on average ‘equivalent’ at the outset of the experiment. Nonetheless, we tested for differences as an additional safety measure. No significant differences between any of the four treatments were detected on DOSPERT or CRT scores. However, as noted earlier, the results regarding the effect of rewards should be interpreted with caution due to the fact that the treatment group for the Stick treatment was not ‘equivalent’ to the CarrStick group at the outset of the experiment.
We omit the Stick results to mitigate any concerns about the difference in the sample.
The statistical significance of the median Geometric Prediction Error in each treatment is assessed using the one-sample Wilcoxon Signed-rank test, under the null that the median is equal to zero.
Available from the corresponding author on request.
Even though the median value of Geometric Deviation for asset X in the Linear treatment is smaller in Round 2, the signed-rank test actually implies a marginally significant increase in the measure because the Round 2 value is larger than the corresponding Round 1 value in 6 out of 7 markets.
Indeed, the standard random effects model is biased and inconsistent if the between and within effects are not the same. The correlated random-effects model (Mundlak 1978), which is closely related to the hybrid model.
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Acknowledgements
The authors would like to thank two anonymous referees and Charles Noursair (the editor) for suggestions. We also thank David Feldman, Thomas Henker, Jeremy Clark, Kenan Kalayci and session participants at the 2015 Experimental Finance Meeting, the 2015 European Financial Management Association meeting, and the UNSW brown bag and seminar participants at the University of Maine and the University of Tasmania for helpful comments. We gratefully acknowledge financial support provided by the Australian Research Council (ARC DECRA Grant Number: DE120101523).
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Paul, D.J., Henker, J. & Owen, S. The aggregate impacts of tournament incentives in experimental asset markets. Exp Econ 22, 441–476 (2019). https://doi.org/10.1007/s10683-018-9562-7
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DOI: https://doi.org/10.1007/s10683-018-9562-7