According to ruth schwartz cowan’s 1983 research, time-saving devices like the vacuum cleaner and washing machine have actually increased the amount of time that women spend on housework. what explanation is given for her finding?
a. these devices just take longer to get the job done than a human being.
b. these devices break so frequently that time gets wasted on repairs.
c. standards of cleanliness have also risen, so even more cleaning is expected.
d. ease of use and availability have led to women cleaning more frequently

Suppose you are a freshmen in college and you have not declared a major. one reason you enrolled at your respective college was the school's vibrant social life. at the same time, you want to balance your academic life because you know that your grades will matter for graduate school or job applications.you decide to forgo partying for two hours to study for an upcoming economics exam. in your first semester's principles of economics class, you learn that the enjoyment you would have received from partying is an example of a(n)