“…Past consumer research on chocolate consumption and purchasing behaviour has focused strongly on the issue of sustainability and ethical consumption (nineteen out of fifty-four papers). Most of the reviewed literature on sustainable consumption and purchasing behaviour used a willingness-to-pay approach [3,4,17,21,30,34,36,42,44,45,47,55], five of which through the auction system [21,34,44,45,47]. The use of visual stimuli within the research studies that focused on sustainability issues has been applied in five studies [30,34,38,53,55].…”