Nairobi, Nov. 4 -- There is always that one friend who reaches for the bill before anyone else has had a chance to open their wallet. At dinner, on a weekend getaway or when booking a group activity, they are quick to pay, trusting that everyone will send their share later.

It may seem like a harmless gesture of generosity, but being the friend who always picks up the tab can come at a cost.

Published by HT Digital Content Services with permission from Business Daily....