Do you have a cite that supports this contention that all women are paid less because some of them take time off? You are, after all, looking at averages and medians, which are affected by the “some” women taking time off, etc.
As others have noted above, the free market is very “efficient” with respect to salaries. If an employer pays its employees too little, they will quit. If an employer pays its employees too much, it will not be as competitive in the market and will suffer the consequences of lost business.
If an employer pays its female employees too little, other employers will take advantage of this and lure them away.
Every study that I’ve ever seen ties women’s lower pay to a combination of their career choices, taking time off to have children, and number of hours worked.
I’ll consider each of these in turn:
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Career choices: For whatever reason, women tend to take lower-paying jobs. There are far more female administrative assistants than male, for example. My company doesn’t care whether an AA is male or female, but they’re not getting paid as much as an engineer.
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Taking time off in mid-career: If you have two mid-level employees, and one has 10 years full-time experience, and the other has four years experience, followed by 2 years off, followed by 3 years of part-time work, followed by a year of full-time work, should they be making the same salary?
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Number of hours worked: My company has salaried employees that typically work 50-60 hours a week. We also have salaried employees (male and female) that only work 40 hours a week. Should they make the same salary? In my experience, women with children are far more likely to fall into the second category, and are typically unwilling to work more than 40 hours in a week because it will keep them from their kids. I’m not saying that anything is wrong with this, but it is a choice that they make.
Now for some anecdotes. My wife works for the (U.S.) federal government. Her job is filled by both men and women. Every employee’s salary is set by their paygrade and time in government service. There is no difference between salaries for men and women.
Prior to this, my wife and I were both officers in the U.S. Navy. Throughout the ranks, pay is set by paygrade and time in service. There is no difference between salaries for men and women.
In my current job, I’m an engineer for a consulting firm in a small branch office. Our two female engineers are paid the exact same amount as the male engineers with the same experience level. If they were paid less, there is no doubt that they would quit in a heartbeat. If anything, female engineers are in more demand because employers like having a diverse workplace.
After posting, I see that some of my points have already been made. Oh well. It took a while to type all of this.