However, we then also get all sorts of feedback effects: ice melts, albedo changes, methane might be released, the drying of soils might kill forests.

FORBES: Not Quite Professor Krugman, Not Quite

Unfortunately we didn't get to experience this wheel's feedback effects, but our brief hands-on time definitely left us feeling confident of its build quality and precision.

ENGADGET: Forza Motorsport CSR and CSR Elite wheel and pedals hands-on

We can go further than that too: when the world was warmer than now we did not see massive positive feedback effects which led to catastrophic global warming.

FORBES: What Excellent News: Earth Warmer Than in Most of the Past 11,300 Years

The economic feedback effects would be disastrous.

FORBES: TPC Scores Perry Plan -- Yikes!

Then the feedback effects kicked in.

FORBES: Maxwell Technologies: The Bottom is In

Alongside the analog oscillators and filters are digital oscillators and effects, plus tunable feedback loops and bit-crushing effects that no other synth has ever had.

ENGADGET: Music Thing: Modern Analog Synths

Schramm clearly intended to tap on the brakes a little, but just as the positive feedback of investor psychology inflated the stock price on the upside, negative feedback exaggerated the negative effects on the downside.

FORBES: Maxwell Technologies: The Bottom is In

Though Hendrix couldn't read or write music, his incredible ability to manipulate the guitar with controlled feedback, distortion, pedal effects and other techniques opened the door to a wide range of possibilities.

NPR: Jimi Hendrix On World Cafe

And one academic review of more than 600 employee-feedback studies found that two-thirds of appraisals had zero or even negative effects on employee performance after the feedback was given.

WSJ: Performance Reviews Lose Steam

That is because ABMs contain feedback mechanisms that can amplify small effects, such as the herding and panic that generate bubbles and crashes.

ECONOMIST: Economics focus