" The couple’s annual income was around around £700 ($50,000 in today’s dollars)—£500 ($36,000) from his salary and another £200 ($14,000) in passive income.

They rented a fourth-floor walk-up apartment in London with four bedrooms, two sitting rooms, and a “nice outlook on green.” The rent was £90 for a year ($530 per month in today’s dollars). To keep it tidy, they hired a live-in maid for £36 ($2,600) per year, which Christie described as “an enormous sum in those days.”

The couple was expecting their first child, a girl, and they hired a nurse to look after her. Still, Christie didn’t consider herself wealthy. "

Ignoring the point and rest of the article but it's a strange and uncanny framing to start it, while simultaneously giving the true numbers, trying to suggest that Agatha Christie in this circumstance of having income 25x that of the working class might not be considered well-off.