Have you ever been asked by a friend to make a donation to their cause? Do you dignify the request with a response?

If you comply, what motivates you to do so? Also, what equation goes into the amount of the donation? Lastly, do you remember the amount?

I'm not sure if there has been a scholarly study on this subject or that the answers to my above questions would be relevant.  

What I do know is that the tables are turned and I'm now in the position of making the Ask!