The phrase "What's good for the goose is good for the gander" is a proverb that means "what is fair for one person should be fair for another." It is often used to argue that people should be treated equally, regardless of their circumstances.

The phrase is thought to have originated in the 16th century, and it has been used ever since to make the point that fairness and equality are important principles. It is often used in the context of gender equality, as a way to argue that women should be given the same opportunities as men. However, it can also be applied to any situation where people are being treated differently without good reason.

For example, if a company is giving raises to some employees but not others, the employees who are not getting raises might argue that "What's good for the goose is good for the gander." This is because they believe that they should be treated equally to the employees who are getting raises.

The phrase "What's good for the goose is good for the gander" is a powerful reminder that we should all be treated fairly, regardless of our circumstances. It is a phrase that can be used to fight for equality and justice in all areas of life.