The supply of people that have the skills to be world-class soccer players is low.

有能力成为世界级足球运动员的人供应量很少。

The lighter the boat, the more versatile it would be, and the less investment of resources it would require — an essential advantage in a decentralized culture without large supplies of people.

船越轻，它的用途就越广，所需投入的资源就越少——对一个没有大量人力并去中心化的文化来说，这是一项基本优势。