The creation of a new coin has no bearing on the scarcity of another. Scarcity is just one requirement for something to act as a currency; another would be tha

The creation of a new coin has no bearing on the scarcity of another. Scarcity is just one requirement for something to act as a currency; another would be that it can be exchanged for goods and services (read: other things that people value, and for which they want things that they also value).