https://be.helpful.com/helpful-how-the-math-of-viral-growth-...
Transitive property of dating. You might not date your coworker but you might date their friend... or a bit less likely a friend of their friend. Etc...
Also known in social gaming as virality, a statistic you can measure.
Also applies to knowledge transfer which is a reason to live near a hub.
Traditionally, work has been a very common place to meet future spouses. I believe the rate has dropped in recent decades, but I would be surprised if it was so low as to be inconsequential, especially when considering something as important as many people view this.
Just the graph: https://cdn.technologyreview.com/i/images/internet-dating.pn...
>By meeting online, or meeting through the Internet, we mean that a couple’s relationship began with an online interaction and then developed into a personal and physical relationship. We coded couples as having met online only if the online interaction was crucial to their having met, regardless of how the couple communicated once they had met. … If the couple first met decades earlier, fell out of touch, and then rediscovered each other through Facebook, that would be “meeting online” for our purposes.
Based on my reading of their criteria, the relationship would be categorized as 'coworker' if they either knew the person at work prior to visiting the bar, they were introduced at the bar through a coworker, or a work event took place at a bar.