i dunno how to compare oversea/local le....
i find it easier if compare...gov U vs private U/Col

1) i notice more private stud in my co than local, but the number of local is still quite surprising for me....

2) dis 1 i not sure....but highest person is foreigner...

3) not really sure, but think all starter start off around the same....no one really stand out of another, unless u r comparing master stud n degree stud
it turn out depends how u contribute later if u out shine others.

as one of the above guy said....cheapest 1....
will u pay higher if u can pay cheaper to get the same or better work done?

ok...lets stick to topic....
who earn more....
foreign probably get better head start compare to local....
or it could be same level of field for some Co
Who has more potential....
kind of subjective....hardly u can know one has a lot capability which still await to be unleashed....

i would say in a mixture of foreign n local grads, potential from local can yield greater, mainly bcoz in dat env, they can more tend to worry if they can perform as good as the others, and has poorer impression to the boss