seen in women in developing countries. For example, many Caribbean rural women use this as a method of increasing the number of things they can accomplish in a day. Increased nuclearization of family Due to the increasing trend of decreased fertility rate, there has been an increased nuclearization of the family, where families have less immediate relatives to depend on in times of need. Because of this phenomenon, families do not have an extended family to depend on when they need a caretaker or someone to do domestic work, and must turn to market substitutes or a member of the immediate family doing both domestic and paid work instead. Gender differences Women Many studies have been done to investigate the division of household labor within couples, and more specifically, on the gender roles played by a variety of people worldwide. According to The State of the World's Children 2007, women generally work longer hours than men regardless if they live in a developed or developing country. Most studies found that when both parents are faced with a full-time job, women are faced with a higher amount of a domestic workload than men. According to the World Bank Latin American and Caribbean Studies, Mexican women in the labor force still spend approximately 33 hours each week performing household responsibilities. In contrast, husbands only contribute approximately 6 hours each week. Even more striking, "daughters contribute 14 hours weekly helping their mothers, while sons spend the same time as their fathers (that is, 5–6 hours weekly)." In a study done by Statistics Canada's General Social Survey of 10,000 households, the average man spent under two hours a day dealing with childcare and house work while women on average spent a little more than three. This study highlights the unequal distribution of labor between partners. Of the people surveyed, under fifteen percent of the couples agreed on doing around the same amount of work in the house. About 83 percent of women participated in housecleaning and food preparation compared to only 51 percent of men who were surveyed. John Frederick Conway's book, The Canadian Family in Crisis, explores effects of the double burden by gender. In Conway's studies, he discovers the physical, emotional, and psychological differences between men and women faced with the double burden in Canada. In these studies it was found that women who are raising children and are in the workforce