Given the correlation between education levels and income, it is easy to see that the more you earn -- or potentially earn -- the more likely you are to take at a walk down the aisle.
Well, that sounds like science to me.
I know "correlation is not causation" is a cliche, but in this case its not hard to figure out that marriage is expensive and hence people with more money to spend are more likely to use it on getting married.
Also possible that people that are good at acquiring money tend to also be good at acquiring mates, and that the money isn't the primary cause.
This sentence borders on absurdity: "Not only does income increase the amount of marriage, marriage also increases the amount of income." .. They are essentially arguing that marriage and money have circular causation.
The only information in the article is that marriage, money, and education are positively correlated.
I know "correlation is not causation" is a cliche, but in this case its not hard to figure out that marriage is expensive and hence people with more money to spend are more likely to use it on getting married.