Women cultivate, plough and harvest more than half of all the food in the world

Today I read an article that is titled "Women cultivate, plough,and harvest more than half of the food in the world." This title stood out as I was browsing and I just had to read it. All of the information that I found was according to the Inter Press Service. In countries such as sub-Saharan Africa and the Caribbean, the women there produce more than 80% of all the food an food products used there. In the food production category, they are actually producing more than 50% of all the food. As well as cultivating, ploughing, harvesting and producing the women in those countries are also raising the live stock that are to be used for food and food processing. These women are severely underpaid and receive no recognition for the work that they do so that everyone can have food. The women are running out of money for supplies and tools that are needed to do the jobs that they do because they are paid so little. Compared to the men, in any country, women are usually getting paid less because the work they are doing is considered "low-status."
I have always wondered why women were always paid significantly less than men. In doing some research , I have found that that is not always the case. For example, women in Brazil, who are under the age of 25, earn a higher hourly wage than the men who do the same jobs. This was the only example that I could really find that was as general as it is.
Many people do not recognize the work that women do everyday and never get paid for. In most cases, women are running the household. Some of the duties that this job entails includes food shopping, cleaning the kitchen, bathrooms, bedrooms and common rooms, restocking food shelves and supplies, driving children to and from school, preparing breakfast, lunch, snacks, and dinner, and childcare in general. All of these jobs are jobs that people get paid to do outside of the home. Women who run a household have all of these duties on their shoulders, a lot of the time with no help. The job of being a mother, wife and house keeper takes of most of a woman's working hours. What i don't understand is why women, who run the household have less power over the household earnings...?