Trading NFTs has become a huge business! There is a video game called Axie Infinity, where you can win NFTs by playing this video game.

John won 3 NFTs playing this game in July, and at the time they were each worth $65. If he were to sell them, he would have to pay $5 in trading fees. In August, the price of each NFT sky rocketed to $300 each! John was so excited that he figured he should quit his jobwhere he was making $30 / hourand instead just play this video game and then sell the NFTs he wins.

John needed to pay his rent for October, so he decided to sell those first three NFTs he won. The price was now only $200 per NFT, and so John was bummed - if only he'd sold in August, he could have made $300 more!

Match the following terms to the following concepts from the situation described above. Note that not all terms might be used and one term might be right for multiple concepts.

Terms

Marginal cost

Sunk cost

Opportunity cost

Fixed cost

Concept from problem	Write in the corresponding term
$5 trading fees
$30 / hour John was making in his original job
$300 more John could have made selling in August