“Unfortunately, Eul couldn’t buy a horse at Byung’s shop. This was because Byung wasn’t able to convert Eul’s overly expensive jewels into money. So, Eul had to travel further to a bigger city. Meanwhile, ‘Gap’, who picked only gold, was now able to purchase a large wagon from Byung and continue visiting the cave,” Biyeon explained.

“…”

She continued, “Traversing back and forth many times, Gap was finally able to command over 100 wagons and hire an army to block the entrance to the cave. Thus, he was able to monopolize the riches within the cave.”

Biyeon then followed up, “Who is the wisest person? The reason being?”

The crew laughed as if the answer was obviously Gap. Rain laughed as well. Her prediction was correct. With a satisfied expression, she looked at Biyeon for confirmation.

“Gap! The reason is speed,” a crewmember shouted out.

However, contrary to everyone’s expectations, Biyeon shook her head and stated, “No. You need to consider opportunity costs and various other factors. Gap was not the wisest.”

All of the crew members tilted their heads to one side in unison. Rain frowned as she thought, ‘What is she talking about?’

“Byung was able to gain the most in the end. Therefore, he is the wisest person. Before Gap took control of the cave, he had to spend all his money to buy items at...