Don't assume that just because people have money that they'll want to spend it the way you would.
Don't pass judgment on someone else's decisions to spend their money on something.
Always consider your friend's financial circumstances before suggesting a particular bar or restaurant.
When splitting the bill, always stop and think about whether an even split is actually fair or not.
When organizing a group gift, outing, or trip, ask everyone to share their individual budget before making any plans.
If you ask a skilled friend to do something for you, offer to pay them just as much as you would any other professional.
When you owe someone money, pay them back right away.
Never ask people how much their belongings -- or rent -- costs.
Don't feel obliged to tell someone how much something cost you, just because they ask.
Refrain from making passive-aggressive comments or assumptions about people's nice things or big purchases.
Don't complain about money to someone who you know earns less than you.
Regardless of what you know about your friends' income, debts, and expenses, remember to always be kind in how you talk about money.