Does the relationship work better when a depressed person marries a happy person?:
Wrong. Tim Harford explains why here:
Three economists, Cahit Guven, Claudia Senik and Holger Stichnoth, have shown that romantic partners tend to be equally happy when they get together. Worse, the same researchers also show that when one partner is much happier than the other, trouble is often in store. A happiness gap in any given year is correlated with an increased probability of separation in the subsequent year.
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