But Wait, there's more;

You’d be shocked to discover how much this idea has scaled. It isn't only physical products per se, but many common services as well, such as dry-cleaning, and haircuts, just to mention one.

According to a publication on researchgate.net, “The Cost of Doing Femininity: Gendered Disparities in Pricing of Personal Care Products and Services'', only 15 out of the 100 randomly selected hair salons had equal prices for both men and women. These numbers were obtained by asking for a simple trim of equal lengths.