In this issue we have:

• On the Role of Group Size in Tournaments: Theory and Evidence from Lab and Field ExperimentsJohn A. List; Daan Van Soest; Jan Stoop; Haiwen Zhou
  
• A Test of Mechanical AmbiguityOechssler, Jörg; Roomets, Alex
  
• Do we need to worry if people bowl alone? Results from a field experiment with voluntary association membersGiacomo Degli Antoni
  
• Fear of being left alone drives inefficient exit from partnerships. An experimentGaudeul, A.; Crosetto, P.; Riener, G.
  
• Can't Touch This! Similarity And The Willingness to Keep "Dirty Money"Sebastian J. Goerg; David B. Johnson; Jonathan D. Rogers
  
• Framing Matters in Gender-Paired Dictator GamesKettner , Sara Elisa; Ceccato , Smarandita
  
• Imitation under stressBuckert, Magdalena; Oechssler, Jörg; Schwieren, Christiane
  
• Exclude the Bad Actors or Learn About The GroupDavid Hugh-Jones; David Reinstein
  
• Risk and ambiguity preferences and the adoption of new agricultural technologies: Evidence from field experiments in rural India:Ward, Patrick S.; Singh, Vartika
  
• The Behavioralist As Tax Collector: Using Natural Field Experiments to Enhance Tax ComplianceMichael Hallsworth; John A. List; Robert D. Metcalfe; Ivo Vlaev
  
• Playing 'Hard to Get': An Economic Rationale for Crowding Out of Intrinsically Motivated BehaviorSchnedler, Wendelin; Vanberg, Christoph
  
• Health information, treatment, and worker productivity: Experimental evidence from malaria testing and treatment among Nigerian sugarcane cuttersAndrew Dillon; Jed Friedman; Pieter Serneels
  
• Using Quotas to Enhance Competition in Asymmetric Auctions: A Comparison of Theoretical and Experimental OutcomesDaniel Hellersteina; Nathaniel Higginsa; Michael J. Roberts
  
• Fictive Learning in Choice under Uncertainty: A Logistic Regression ModelDonald J. Brown; Oliver Bunn; Caterina Calsamiglia; Donald J. Brown
  
• Group size and decision rules in legislative bargainingMiller , Luis; Vanberg, Christoph
  
• Institutions as game theory outcomes: toward a cognitive-experimental inquiryAmbrosino, Angela
  
• Workers' propensity to cooperate with colleagues and the general population: a comparison based on a field experimentErmanno Tortia; Martha Knox Haly; Anthony Jensen