Final answer:
By observing the code of ethics, members of trade associations promote professionalism and harmony in the real estate industry and benefit the public. Trade associations work to improve working conditions, promote new practices, and represent industry interests.
Step-by-step explanation:
By observing the code of ethics, members of local, state, and national trade associations promote professionalism and harmony and further the interests of the real estate industry as well as the public. Trade associations, such as the National Association of Realtors, work to improve working conditions, promote new practices, and represent the interests of their industry. These associations also collaborate and network with other professionals in the field.