Emily saw a "Monchichi" doll at a discounted price of HK$100 in a shop. She took it to the cashier for payment. However, the shopkeeper Harvey told her that the price of the l'Monchichi" doll was wrongly labeled and should be changed to HK$300. Emily insisted on buying at the labeled price but Harvey refused. Discuss the legal position of each party. Alan made a contract with Betty selling her his antique vase for $25,000. When he delivered the vase to Betty, he told her that he would accept $20,000 as he had moved to a small apartment and no longer had the necessary space for the vase. Betty gave Alan $20,000 and her stamp collection valued at $100 in exchange for the promise. Two weeks later, Alan changed his mind and requested Betty to pay him the outstanding balance for $5,000. Advise Alan of his legal position