Real estate agent, negotiator and mandatary: what's the difference?

Following Bat info source: SAFTIA
Citya Immobilier real estate agency in Tours - © Thomas178774 via Wikimedia Commons - Creative Commons License

A growing share of transactions are carried out by professionals whose status differs significantly from that of the traditional real estate agent. Negotiator, commercial agent, real estate agent… These professions, in full expansion, are most often carried out by freelancers who tend to join networks to simplify and secure their activities.