“…Although there are some experimental studies investigating mergers (e.g., Fonseca & Normann, ; Huck, Konrad, Müller, & Normann, ) or quality competition (e.g., Henze, Schuett, & Sluijs, ), in a nonhealth context, they do not account for both quality competition and mergers, nor do they account for the particularities of hospital markets such as altruistic providers. There also are various health economic experiments investigating the role of altruism or professional norms for medical provision behaviour on an individual level (Brosig‐Koch, Hehenkamp, & Kokot, ; Brosig‐Koch, Hennig‐Schmidt, Kairies‐Schwarz, & Wiesen, ; Brosig‐Koch, Hennig‐Schmidt, Kairies‐Schwarz, & Wiesen, ; Godager & Wiesen, ; Hennig‐Schmidt, Selten, & Wiesen, ; Kesternich, Schumacher, & Winter, ). Brosig‐Koch, Hehenkamp, et al () investigate quantity competition between two physicians.…”