It is increasingly common to find women who make more money than their male partners. Although nowdays women not receive equal pay for equal work, they are increasingly accessing, to management positions or occupations that allow them to generate good income.
The Anglo-Saxon countries is not too relevant what is happening, but I think that for Latin countries, the issue is more than social.
Many men feel uncomfortable and even unsafe at the idea of having next to a woman “as independent” not only does not need protection, but also can take over (some or all) of the household living expenses and children. There are still many men who do not like your wife work outside the home, they prefer to engage children and domestic issues and, at best, have a hobby or occupation (profitable or not) that you input a few hours a week. If a woman must work out of economic necessity, they accept it reluctantly, and under no circumstances accept that she is who else wins.
Then do everything possible to feel comfortable in the reality they live in, accepted, and shall stimulate growth of another without limit, and, above all, talk about what bothers them. No need to underestimate because of who earns less, there are circumstances that observer wishes another perspective can be highly advantageous. It is worth bearing in mind all the advantages that this brings, and understand that in a couple, the common goal is the same regardless of who generates more revenue.