Stop agreeing to pick up the check every time already.
This article originally appeared on Money.
Friday is National Middle Child Day. You didn’t know? That’s because you were probably too busy applauding the latest achievement of your eldest or spoiling the youngest one to notice.
Stereotypes aside, psychologists have long known that birth order tends to produce some distinctive personality traits among siblings, and those behaviors can affect everything from your choice of career to your willingness to invest in a start-up. Middle children have a reputation for being outgoing and sociable, for running from conflict and seeking compromise. Those can be terrific assets at the Thanksgiving dinner table, but they may not do your finances any favors. Here’s how some common middle-child traits can affect your bottom line.