Jim and Della were the richest couple on earth. This is paradox. Explain why?

The paradox is that Jim and Della are actually poor. His
job earns only enough to eke out an existence while she is a housewife. What did it mean
that they were the richest people on earth? Riches don't always refer to money. They are
rich in their love for each other. They are rich in the sacrifices they make for the
other. They are rich in their wisdom that those gifts, which seemed so useless at the
present, will become of great value in the future. Della's hair will grow back, and the
combs will enhance her beauty. Jim will redeem his watch at the pawn shop, and the fob
will display his beautiful watch. Neither found disappointment that Christmas, only a
deep and abiding love for each other.