Concentrated Distribution

In China it is also wise not to be completely dependent on one relation. Whether it concerns a client or supplier, a distorted relationship will often cause pressure. This will result in a weak negotiation position which, in some situations, will cost you dearly.

Satisfaction with the current situation should not be an excuse to ignore other purchasing channels. 
Allowing assignments to circulate within a piggy bank of suppliers with the same abilities will provide greater flexibility to anticipate economic and regional developments.  

Aside from being better equipped to handle rush orders, the piggy bank will provide something to fall back on when a purchasing channel is lost.  
Of course, the real art is finding the right way to hint that you are not dependent on one particular party.