One of the first questions the HR of your potentially new workplace asks is how much you make currently, then add 30% and this becomes the salary you're looking at at your new place. I didn't know this on my first job and asked for something which is less than industry average by exactly 30%, coincidentally.
Soon I may be be negotiating salary with my potentially new employer and I would like to be able to negotiate a salary that's based on the actual value for that position rather than what I make currently.
What's the best way to approach such a situation?