Have you ever seen this. An agent takes a listing on Wednesday. instead of putting it on to MLS, they keep it to themselves but they have time to put an Open House ad in the newspaper and get a sign ordered. If they don't double end it themselves over the weekend, they will put it on MLS. In a hot market, they have a good chance of being the buyers agent.
If you see this, you should file a Grievance with your Association.
I must not have been clear. I have received several answers to this Blog saying that the Seller can instruct the agent to hold it off the market. I agree. I was talking about the agent who doesn't tell the seller and delays putting it on MLS so they have a chance to sell it themselves. This is a breach of fiduciary duty since the best way to get a competitive offer is to let the rest of the real estate community have a shot at the listing