"did you pay different ammount" now goes the right way around.

text_interface/addstock.py

@@ -92,7 +92,7 @@ much money you're due in credits for the purchase when prompted.\n'''
 
     def perform_transaction(self):
         print 'Did you pay a different price?'
-        if not self.confirm('>', default=True):
+        if self.confirm('>', default=True):
             price = self.input_int()
             if price > self.price:
                 print 'Illegal action, total can not be higher than your total.'