Opportunity Cost

Yesterday, I was faced with the decision to either buy a $1 candy bar (as part of my school's fundraiser) or spend the $5 I currently had to sign up to participate in the IB Dessert. Yesterday was the last day that students or parents could pay to attend the IB Dessert, so my choice was either to get the candy bar - effectively preventing me from purchasing the IB Dessert ticket as I would have an inadequate $4 - or get the ticket which would leave me with no money to buy the candy bar. I chose to spend my money on the IB Dessert (what a good student) and forfeit the candy bar. With the IB Dessert ticket purchase, my opportunity cost became my obtaining of any candy bars that were for sell that day.