When reviewing the different contract classifications, you will find that express contracts are few in number and implied reigns supreme. In addition, quasi-contracts are not contracts, but are the court's way of making a wronged party whole due to unjust enrichment of the other party to the contract, which usually supports the equitable remedy of promissory estoppel (Reed, Pagattaro, Cahoy, Shedd, & Magid (2015). Under what conditions can contractual duties be modified? When does promissory estoppel apply? How are damages different than equitable remedies? Provide examples.