it is not at all like that it happens

when a model starts to make money, basically she would be welcomed in almost all agencies, so when a switch actualy happens, it is not the model who "apply", it is the agency who wants her who appraoch her, usually in trying to propose better financial deal than what she has.
modeling business at high level is very very small world, so most deals are done through contacts between people...
For a girl just starting, the very small word is very effectiv too, if you are agent, and that you have a girl that nobody wanted who starts to have some good jobs in let's say a small agency, very quickly your phone can become very busy, with most agencies proposiong you more money if you place the girl to them. Even if 3 months before you had proposed her but they were not interested
