A £15 per hour minimum wage would impact half of full-time workers across Scotland.
The Trades Union Congress (TUC) has said that the minimum wage should be increased to £15 per hour.
The minimum wage is currently set at £9.50 an hour for workers over the age of 23, £9.18 for 21 and 22 year olds, and £6.83 per hour for 18 to 20 year olds.