If the people have the right to choose their leader free from any outer pressure then this system is called the democracy.
The development of a country depends upon the prosperity of a country, and prosperity it depended upon the justice in the country. If people get their rights and justice then the country will be become developed. All these things are depended to the democracy of a country. If there is only one ruling party in the country and act as the superpower in the country then the economy of a country will become destroyed and the people will become irresponsible from their duties.
In such conditions the corruption robbery and unemployment will go to its peak level and the nation of a country will become disappointed from the system of a country and they will start destroying the assets of a country and if they become more serious then they will destroy the public property.
On the other hand if there are many political parties in the country then the nation of a country have the right to choose their leader and all the parties will work with proper rules and work for the development of a country and will work for the nation, because they knew that if the will not work properly then the nation will not select them and they will become fail but in contrast if there are many parties then they knew that they are superpower and they will rule forever. In the condition of democracy the country will become more and more developed and the nation will become developed and they have open mind in choosing the leader and will decide from their own mind.