If your meaning you have signed a listing agreement with a real estate agent and you now don't want to sell...after the listing is in effect for a short time, maybe a few ads placed, sign up...but NO...
Only if there is wording in the contract which permits this, or if the law in your state permits certain changes without mutual consent. Otherwise, by tampering with the contract your landlord may...
If you have already signed the deed it is too late to make the buyer go away. If you have only signed a contract to sell the house you could refuse to go through with it. But this would leave you...
No. Only the seller can change the listing price.
However, there's nothing to stop a buyer from offering to purchase the property for a higher amount. In fact, this is quite common in what are known...