To investigate the bargaining between the start-up's founder and the provider of complementary assets,we denote by x the amount allocated to the employee in the bargaining and we assume for simplicity that all potential alternative providers are identical. Thus, considering that the provider of the complementary assets saves the cost C(K) in case of disagreement, the threat-points of the start-up's founder and of the provider are αx and C(K), respectively. The joint surplus to be allocated is πE s(K). Accordingly, we have that: