 We  show that this transition is  induced by an asymmetry between the rate of hiring and the rate of firing of the firms.
<meaning-changed>  We  show that this transition is  induced by an asymmetry between the rate of hiring and the rate of firing of the firms.
 We introduce a simpler framework that allows us to show that this transition is induced by an asymmetry between the rate of hiring and the rate of firing of the firms.