In this scenario, the removal of certification and training requirements for hairdressers is likely to increase the supply of hairdressers in the labor market, as more individuals may enter the profession without needing certification. This increase in supply, without a corresponding increase in demand, is likely to lead to lower wages for hairdressers.
Therefore, the most likely outcome in the labor market for hairdressers is:
The wages paid to hairdressers will fall.