What is Lego arbitrage?

Lego arbitrage involves buying Lego figures or sets at a lower price in bulk, typically through platforms like eBay, and then selling them individually at a higher price. Brad Barrett shared an example where his daughters noticed that the cost per Lego figure decreased significantly when purchased in large quantities. They aimed to buy lots of Lego figures cheaply and sell them individually for a profit, exploiting the price inefficiencies 1 .