in a party system of politics you need a party ticket to be in the public eye to get elected so if you control the party heads of a country [2 people] you control the whole population of the country as you get to make the rules you get to decide which private corporation gets to have a news media channel who gets government contracts,what is taught in school and college, you get to decide at what rate farmers get to sell their produce , so if you want more workers in the city to work in industries you reduce the rate at which they can sell their produce