A lot of couples fight over money or argue over who pays for what, especially in a world where the “man” is no longer the sole “breadwinner.” But what does “fair” really look like in today’s society — and when might a marriage counselor (or divorce) be in order? Take the hypothetical example of Nick and Katia. Nick works in finance and makes $700,000 a year, while Katia works for the federal government and earns an annual salary of $90,000. They’ve been married for 10 years and have no kids. Each month, ...