Lily has got a Black Pink concert ticket for $500. However, when she arrived at the concert venue, she realized that she had lost the ticket on the way there. Lily is a big fan of Black Pink and she had waited for this concert for a very long time. A person approached her and offered his ticket for $600. If the value this concert brings to Lily is worth $1,000, shall she buy the ticket (assuming the ticket is authentic)? Explain your answer with reference to the most relevant principle of economics you learnt in class.