Is listing agreement unilateral or bilateral?

A listing agreement is:

  1.   a unilateral contract
  2.   a bilateral contract
  3.   both a and b
  4.   none of the above

The answer is B – In a bilateral contract, a promise from one person is made in exchange for a promise from another person.

And in a listing agreement, the seller promises to pay the broker a commission provided that the broker is able to sell his home under certain terms.  The broker in turn promises to use diligence in attempting to find a buyer for the property under terms that are ac- ceptable to the seller.