Does any relationship exist between trade unions and wages?

A primary goal of trade unions is to maintain and improve workers’ terms and conditions, particularly workers who are members of the union, through collective bargaining with employers. Whether unions are successful depends, in large part, on their bargaining strength – which is based on their ability to restrict the supply of labor to the employer – and the ability of employers to concede above-market wages

Thanks for invitation

I amagreeing with my colleague’s answer Mr Tarig

I agree with Mr. Tarig's answer. Thanks. 

I apologize for the answer, I leave the answer to experts specialists in this field that's not my specialty field