How about telling them your previous pay if they agree to tell you how much they paid the person you could be replacing. I'd be tempted to put down zero - I ho

How about telling them your previous pay if they agree to tell you how much they paid the person you could be replacing. I'd be tempted to put down zero - I hope people in the position of reading job applications will understand that this is a piece of valuable information that it is perfectly reasonable to want to keep to yourself.