In May, Zach agrees to work for Affordable Plumbing Supplies Company at $800 per week for a year beginning June 1. The following January, Budget Pipes & Fittings, Inc., offers Zach the same work at $900 per week. Zach tells Affordable Plumbing about the offer. Affordable Plumbing offers to enter into a new contract with Zach at $875 per week. If Zach agrees, is the new Affordable Plumbing contract enforceable? Why or why not?