This was identified as the main cause of the gender pay gap, a serious issue which has led to women being undervalued for equivalent work to men.
Nodwyd mai hyn oedd y rheswm pennaf am y bwlch cyflog rhwng y rhywiau, sy'n fater difrifol sydd wedi arwain at gyflogau llai i fenywod am wneud yr un gwaith â dynion.