[dimitar]

Negative feedback in markets often brings stability to a dynamical system and there is reason that there are negative feedback loops in markets.

A popular model of a negative feedback relationship in markets is called the 'Demand curve'.

[fanf2]

There is also positive feedback in markets due to irrational exuberance and herd behaviour.

[JonnieCache]

Can this still be said when we're considering the economy of a whole country, or the whole world?

[jacques_chester]

Both. Trade exists across invisible lines, even when the owners of the invisible lines forcibly try to prevent them.