Solidarity in collaboration networks when everyone competes for the strongest partner: a stochastic actor-based simulation model

Figures & data

Table 1. Model specification in the baseline scenario.

Parameter	Coefficient value
Collaboration
Outdegree	−4
Reciprocity	3
Resource popularity	3
Association with Trust	1
Trust
Outdegree	5
Outdegree slope	−1
Reciprocity	1
Transitive triplets	0.5
Association with Collaboration	1
Support expectations
Outdegree	5
Outdegree slope	−1
Reciprocity	1
Transitive triplets	0.5
Association with Trust	1

Table 2. Simulation design.

Scenario	Distribution of $R$	Distribution of $N$
Baseline	equal	–
Competition	heterogeneous	–
Competition/Neediness	heterogeneous	heterogeneous

Table 3. Average degree and gross segregation (log-transformed) of Mutual support expectations networks in simulation scenarios. Mean values were averaged over 1,000 realizations, standard deviation are reported in parentheses.

	Outcome
Scenario	Average degree	Gross segregation
Baseline	1.45 (0.24)	−0.02 (0.63)
Competition	1.38 (0.24)	0.40 (0.66)
Competition/neediness	2.05 (0.47)	0.98 (0.80)

Figure 1. Boxplots of average degree and gross segregation across simulation scenarios (1,000 realizations each). Bold horizontal lines indicate median values, red dots indicate mean values.

Figure 2. Simulated dynamics of average outdegree of Collaboration, Trust, and Support expectations networks. (Values averaged over 100 replications).

Figure 3. Simulated dynamics of average outdegree of Collaboration and Support expectations within and between resource classes across scenarios. (Values are averaged over 100 replications).

Figure 4. Instances of simulated Mutual support expectation networks across scenarios. Node colors represent resource classes. Green: $L$-agents; red: $H$-agents.. In the Printed version Black: L-agents; white: H-agents

Figure A1. Average degree of Mutual support expectations across scenarios for $n=$ 20, 50, and 100. (Mean values over 1,000 realizations).

Figure A2. Gross segregation (log) of Mutual support expectations across scenarios for $n=$ 20, 50, and 100. (Mean values over 1,000 realizations).