i was on both sides, if somebody does not have a lot experience or does not know how much they are worth, its easy to exploit, you ask them what they currently earn and what they expected salary is, and on that you can judge the new salary. the last candidate that i hired said something even under the lover range that i expected, so i offered him a decent bump (20%) on that as i did not want to underpay him.

if i end on the other side again i will ask for the upper range for myself and see where it gets me.