depends on what kind of friend loh....
true friend will understand that business is business... they might squeeze abit but you need to know your limit how much to be sqeezed out loh....
if they squeeze to much, i just told them off lar... no point wat.. why wasting time and biz is not charity mah...
if you have partners then its more simpler to handle this type of friends... just ask the partner to back u up and become the bad guy loh..... its work every single times...
