Often I come up with the following reasoning when it comes to why collector has larger area than the emitter:
For less power dissipation collector area should be more. In other words, when area is more, resistance is less for a given current and hence power dissipation is less.
Usually base area < emitter area < collector area
But this argument confuses me because the collector and emitter passes almost the same amount of current. What is the point of saying collector needs to dissipate more power hence it needs to have greater area. If Ic and Ie are almost the same why wouldn't both regions dissipate the same power?