Environmental and technical conditions of household work have greatly changed. The same can be said for each family's or housewife's subjective conditions; i.e., idea, image and thought held toward household work. The changing conditions affect the marginal result utility of household work or of other labor, and marginal pain of household work. These effects cause a transfer of the subjective equilibrium point.
We know, from these analyses, the effect of the environmental conditions on subjective conditions, and those of their results or processes. These analytical studies show the need to cope with the behavioral attitudes of each household worker and family, and also open a new frontier of dynamic studies on household work.