What defines a compulsory trade?

A compulsory trade is defined as a trade that requires individuals to obtain certification or a license in order to practice legally. This certification ensures that practitioners have met the necessary standards of education, training, and experience, safeguarding public safety and integrity within the profession. In compulsory trades, regulatory bodies oversee the credentialing process, affirming that workers possess the requisite skills and knowledge.

The other choices do not align with the definition of compulsory trades. Self-regulation implies a level of autonomy without mandated oversight, while a voluntary trade does not require certification for practice. Lastly, a trade with no certification necessity would contradict the very essence of what makes a trade compulsory. Thus, the requirement for certification is a key characteristic that distinguishes compulsory trades from other types of trades.