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【多选题】
以下关于网络外部性的描述中正确的是?
A.
只要存在网络关系，就必然存在网络外部性
B.
根据梅特卡夫法则，网络价值随网络规模增大而线性增长
C.
网络外部性是外部性在网络系统中的特例
D.
基于严格的经济学定义，网络效应和网络外部性可视为同一概念
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