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Roman Sheremeta
  • Chapman University
    Beckman Hall, 303L
    One University Drive
    Orange, CA 92868
We analyze a group contest in which n groups compete to win a group-specific public good prize. Group sizes can be different and any individual player may value the prize differently within and across groups. Players expend costly efforts... more
We analyze a group contest in which n groups compete to win a group-specific public good prize. Group sizes can be different and any individual player may value the prize differently within and across groups. Players expend costly efforts simultaneously and independently. Only the highest effort (the best-shot) within each group represents the group effort and the winning group is
This paper experimentally examines behavior in a two-player game of attack and defense of a weakest-link network of targets, in which the attacker's objective is to successfully attack at least one target and the defender's... more
This paper experimentally examines behavior in a two-player game of attack and defense of a weakest-link network of targets, in which the attacker's objective is to successfully attack at least one target and the defender's objective is diametrically opposed. We apply two benchmark contest success functions (CSFs): the auction CSF and the lottery CSF. Consistent with the theoretical prediction, under
We study experimentally the effects of cost structure and prize allocation rules on the performance of rent-seeking contests. Most previous studies use a lottery prize rule and linear cost, and find both overdissipation relative to Nash... more
We study experimentally the effects of cost structure and prize allocation rules on the performance of rent-seeking contests. Most previous studies use a lottery prize rule and linear cost, and find both overdissipation relative to Nash equilibrium prediction and significant variation in individual subject efforts. In a 2 2 design, we investigate the effects of sharing the prize proportionally and
Costless pre-play communication has been found to effectively facilitate coordination and enhance efficiency by increasing individual payoffs in games with Pareto-ranked equilibria. We report an experiment in which two groups compete in a... more
Costless pre-play communication has been found to effectively facilitate coordination and enhance efficiency by increasing individual payoffs in games with Pareto-ranked equilibria. We report an experiment in which two groups compete in a weakest-link contest by expending costly efforts. Allowing group members to communicate before choosing efforts leads to more aggressive competition and greater coordination, but also results in substantially
Abstract: We use a Tullock-type contest model to show that intuitively and structurally different contests can be strategically and revenue equivalent to each other. We consider a two-player contest, where outcome-contingent payoffs are... more
Abstract: We use a Tullock-type contest model to show that intuitively and structurally different contests can be strategically and revenue equivalent to each other. We consider a two-player contest, where outcome-contingent payoffs are linear functions of prizes, own effort, and the effort of the rival. We identify strategically equivalent contests that generate the same family of best response functions and, as a result, the same revenue. However, two strategically equivalent contests may yield different equilibrium payoffs. Finally, we ...
This experimental study compares sequential and simultaneous multi-battle election contests. We find substantial evidence of a “New Hampshire effect” in the sequential contests, ie the winner of the first battle wins the overall contest... more
This experimental study compares sequential and simultaneous multi-battle election contests. We find substantial evidence of a “New Hampshire effect” in the sequential contests, ie the winner of the first battle wins the overall contest with much higher probability than the loser of the first battle. However, contrary to theory, sequential contest generate substantially higher expenditure than simultaneous contest. This is mainly because losers of the first battle do not decrease their expenditure in the second battle; and winners of the ...
ABSTRACT We designed an experiment to study behavior in information transmission games where underwriters have economic incentives to deceive and investors have incentives to avoid deception. Theory predicts that investors should not be... more
ABSTRACT We designed an experiment to study behavior in information transmission games where underwriters have economic incentives to deceive and investors have incentives to avoid deception. Theory predicts that investors should not be able to glean information from the underwriters’ reports, and thus investment decisions should be based solely on the investment’s fundamental risk. To test this prediction we elicited choices from risky gambles constructed to be mathematically equivalent to the information setting if the underwriters’ reports had no information content. Participants acted simultaneously as underwriters and investors in one-shot information transmission games. Our findings indicate that underwriters acted deceptively, while investors invested conditional on the underwriters’ reports. Moreover, investors invested significantly more often when the expected return from the investment was relatively high. We observed that investors both gleaned and gambled, and those who gleaned earned higher payoffs.
Research Interests:
Many economic interactions are characterized by “all or nothing” action spaces that may limit a demonstrable index of trust and, therefore, the propensity to reciprocate. In two experimental trust games, the action space governing... more
Many economic interactions are characterized by “all or nothing” action spaces that may limit a demonstrable index of trust and, therefore, the propensity to reciprocate. In two experimental trust games, the action space governing investments was manipulated to examine the effects on investments and reciprocity. In the continuous game the investor could invest any amount between $0 and $10, while in the binary game the investor could invest either $0 or $10. In both games, the trustee received the tripled investment and then could return any amount back to the investor. Investors invested significantly more in the binary game than in the continuous game. However, higher investments in the binary game did not lead to more reciprocity. To the contrary, conditional on investment of $10, on average trustees returned significantly less in the binary game than in the continuous game.
Research Interests:
Abstract: We compare the determinants of individual giving between two countries, Spain and the US, which differ in their redistribution policies and their beliefs over the causes of poverty. By varying the information about the... more
Abstract: We compare the determinants of individual giving between two countries, Spain and the US, which differ in their redistribution policies and their beliefs over the causes of poverty. By varying the information about the determinants of income, we find that, although overall giving is similar in both countries when subjects know the actual role of luck and effort, Spanish subjects give more when they are uninformed compared to American subjects. Using elicited beliefs, we find that this is due to Spanish subjects associating ...
We compare the determinants of individual giving between two countries, Spain and the US, which differ in their redistribution policies and their beliefs over the causes of poverty. By varying the information about the determinants of... more
We compare the determinants of individual giving between two countries, Spain and the US, which differ in their redistribution policies and their beliefs over the causes of poverty. By varying the information about the determinants of income, we find that, although overall giving is similar in both countries when subjects know the actual role of luck and effort, Spanish subjects
We study how salient group identity, created through competition between students from different universities, as well as differences in the value of winning impact competitive behavior. Our experiment employs a simple all-pay auction... more
We study how salient group identity, created through competition between students from different universities, as well as differences in the value of winning impact competitive behavior. Our experiment employs a simple all-pay auction within and between two university subject pools. We find that when competing against their peers, students within the lower tier university bid more aggressively than students within the top-tier university. Also, students from the lower tier university, in particular women, bid more aggressively when competing against students from the top-tier university. These findings, interpreted through a theoretical model incorporating both group identity and differential value of winning, suggest that students at the lower tier university have a stronger group identity as well as higher desire to win.
Research Interests:
Experimental studies suggest that women are less competitive than men because they avoid tournament payment schemes. However, women also bid more aggressively in auctions, suggesting greater competitiveness. We design an all-pay auction... more
Experimental studies suggest that women are less competitive than men because they avoid tournament payment schemes. However, women also bid more aggressively in auctions, suggesting greater competitiveness. We design an all-pay auction experiment that rules out confounds, such as risk aversion, which would decrease entry into tournaments and also increase bids in auctions. The design, based on the predictions of a simple game theoretic model, requires revealing the gender of the opponent. Using this design, we find that women only bid higher than men when competing against other women, ruling out gender specific factors unrelated to strategic considerations. Our findings suggest that women have a higher value of winning which may not be reflected in tournament entry decisions, but may be important when bidding in auctions.
Research Interests:
We find the sufficient conditions for the existence of multiple equilibria in Tullock-type contests, and show that asymmetric equilibria arise even under symmetric prize and cost structures. We then present existing contests where... more
We find the sufficient conditions for the existence of multiple equilibria in Tullock-type contests, and show that asymmetric equilibria arise even under symmetric prize and cost structures. We then present existing contests where multiple equilibria exist under reasonably weak conditions.► Sufficient conditions are found for the existence of multiple equilibria in Tullock contests. ► Asymmetric equilibria arise even under symmetric prize and cost structures. ► Examples of existing contests where multiple equilibria exist are given.
We experimentally study overbidding in contests and find that overbidding is significantly higher when subjects are given a large per-experiment endowment rather than when the endowment is given per-period. Risk-aversion and non-monetary... more
We experimentally study overbidding in contests and find that overbidding is significantly higher when subjects are given a large per-experiment endowment rather than when the endowment is given per-period. Risk-aversion and non-monetary utility of winning can partially explain our findings.► We experimentally study overbidding in contests. ► Overbidding is higher when the endowment is per-experiment than per-period. ► Risk-aversion and non-monetary utility of winning partially explain our findings.
This study reports an experiment that examines whether groups can better comply with theoretical predictions than individuals in contests. Our experiment replicates previous findings that individual players significantly overbid relative... more
This study reports an experiment that examines whether groups can better comply with theoretical predictions than individuals in contests. Our experiment replicates previous findings that individual players significantly overbid relative to theoretical predictions, incurring substantial losses. There is high variance in individual bids and strong heterogeneity across individual players. The new findings of our experiment are that groups make 25% lower bids, their bids have lower variance, and group bids are less heterogeneous than individual bids. Therefore, groups receive significantly higher and more homogeneous payoffs than individuals. We elicit individual and group preferences toward risk using simple lotteries. The results indicate that groups make less risky decisions, which are possible explanations for lower bids in contests. Most importantly, we find that groups learn to make lower bids from communication and negotiation between group members.

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