Highlight three merits and demerits each of a simple majority system voting

Three merits of simple majority system of voting 

1. Election is easy to conduct under the system, 
2. because it is less expensive,
3. Winners or victorious candidate of such
   election can easily be determined 

Three demerits of a simple majority’ system of voting  

1. The
   system does not reflect the wishes of the majority of voters 
2. The system can encourage
   rigging of elections
3. The system can encourage
   the existence of several splinter parties.