What are some physical products that exhibit network effects?

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VC -> failed to level up as an operator -> VC

Square card reader was a good example of this.

The only problem is externality pricing.

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Maybe there’s an ouija board nuance I’m missing here but how does my ouija board have more value if they’re are 5 other friends have it vs. just 1 of my friend.

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Slightly unrelated: Can anyone recommend good blog post or books about network effects?

Great question. 

Cell phones, even clamshell phones. Packs of cigarettes. Some Veblen goods, especially fashion items.