On February 9, 2007, Shawn and Michelle entered into a contract whereby Shawn agreed to

purchase, and Michelle agreed to sell, 1000 crates of Valencia oranges at a price of $3.00 a crate,

with delivery no later than September 1, 2007. On August 30, 2007, Michelle called Shawn to

say she had enough Valencia oranges to make the delivery but had decided she didn't want to sell

them to her. She offered Shawn 1000 crates of navel oranges instead. (A) What issues are raised

in this situation?