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by TeMPOraL 5283 days ago
Yeah, quoting from that link:

"He was saying a real startup trajectory might look something more like this" (emphasis mine)

When we're graphing trajectories, not functions, loops are certainly allowed (see e.g. phase diagrams[1]). Still, without labeled axis those graphs are pretty much meaningless, so I treat them more like an conceptual illustration.

[1] - http://en.wikipedia.org/wiki/Phase_space