It's become fashionable to demean millennials as the "snowflake" generation. Raised during the peace and prosperity of the '90s, they're often perceived as carrying an entitlement mentality and being incapable of handling adversity. But Philip Klein sees them differently. Given the economic headwinds they faced at the start of their working lives, millennials have shown commendable fortitude. And as Klein argues, they will need to maintain this character...