This dataset accompanies the paper "Competing for congestible goods: experimental evidence on parking choice", https://doi.org/10.1038/s41598-020-77711-w It records participant decisions whether to park their car in two different types of car park lots. See details of the experimental setup in the paper. Explanation of the data fields: #ratioSN: proportion of available spots in the cheap car park lot (S) to the number of people (N) #Qexp: see experimental setup #Qadd: see experimental setup #round_number: round number #participant.code: identification number for each participant in each treatment #choice: park slot chosen by the participant (0: expensive (blue) car park; 1: cheap (yellow) #myParking: park slot assigned to the participant (0: expensive (blue) car park; 1: cheap (yellow) #player.risk_i: (only for round number 10) answer to ith question of risk assessment test (see paper).