31.   Two decades later, though, the consumer-producer feedback loop is less efficient than Toffler had hoped.

32.   Web pages are more flexible than conventional advertisements because they include a feedback loop that can tell operators who has been visiting a site.

33.   While the Tobin tax is unlikely to make headway in the United States, there is evidence that a feedback loop is operating between Europe and United States.

34.   When women saw that they really were more aroused, their expectations rose, creating a positive feedback loop.

35.   With redwoods thriving in a wet environment and thriving redwoods making the environment wetter, the interaction forms a positive feedback loop.