Opinion dynamics driven by leaders, media, viruses and worms
  A model on the effects of leader, media, viruses, and worms and other agents on the opinion of individuals is developed and utilized to simulate the formation of consensus in society and price in market via excess between supply and demand. Effects of some time varying drives, (harmonic and hyperbolic) are also investigated.   Key words: Opinion; Leader; Media; Market; Buyers; Sellers; Excess 
Caglar Tuncay