Figure 1.
The diagram visualises the relationships among four core variables: reward type, internal reference price, intrinsic motivation, and willingness to pay. At the top, reward type is linked directly to willingness to pay through a solid arrow, indicating a direct effect. Internal reference price sits centrally and connects to both intrinsic motivation and willingness to pay, also via solid arrows. A compound variable, reward type by time of day, is positioned to the side and connects to internal reference price and intrinsic motivation with dashed arrows, representing moderation effects. A legend at the bottom clarifies the meaning of each arrow style, distinguishing direct effects, moderation effects, and moderated mediation effects.Conceptual model
Source: Authors’ own work