Asmall network is more effective than a large network. true or false

That depends on what kind of network you are talking about. 

In terms of internet, a smaller network is better,  because that means more speed for the people that are doing the work.

In terms of survivability, a larger network is better, for there are more people to be able to obtain collections of necessaries and help them have a higher survival rates

These are just two examples, there are a lot more.

This points out that it depends on the context

hope this helps