In some cases this back-and-forth loop repeats multiple times, stretching over months.

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It is also a force in digital loop carriers, which convert multiple voice calls into a single digital signal and can use either copper or fiber-optic cables.

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Robust economic growth--3.3% or better, over multiple years--sustains a positive feedback loop.

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Traders use multiple markets at once and create a feedback loop.

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The firm and its architect, NBBJ, looked at how fast people can walk and measured the diameter of the space from multiple angles. (An "infinity-loop"-shaped pathway slopes through the building, connecting employees to each other.) In addition, the floor plan is narrower than typical offices, keeping teams in sight range of one another.

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