Greatest advantage is that if it is a true demorcay humar rights are given importance. People can change the ruler or administration after their tenure is over. The classical example is post independent India where a single party ruled for more that 30 years thru demorcatic means and a autocratic movement on the part of Congress leader Mrs.Indira Gandhi (by declaring state of emergency) cost her the chair in 1977. At that time the literacy of India was less than 50%. This is a classical example of victory of democracy..