For instance, the core countries have an incentive to gain a profit and this enables the world market to further grow.

This type of interaction is unique because the core country involved is somewhat weaker than normal.

But if Russia turns into the core country of a civilization, its distance from the West will become more difficult to bridge.

Constraints of the monetary union are also taking a toll on the core European countries.

These countries took on the definition of a core country.

Semi-periphery countries usually surround the core countries both in a physical and fundamental sense.

A monetary union limited to these "core countries" would reduce the economic tensions associated with extreme differences in productivity.

When excess supply occurs, the core countries are the ones competing over a smaller market.

As Parliament will know, Russia is a core country under this programme.

This constantly reinforces the dominance of the core countries.