What does the author mean when stating that certain inventions made farming "capital

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What does the author mean when stating that certain inventions made farming "capital-intensive rather than labor-intensive"?

Workers had to be trained to operate the new machines.

The new inventions were not helpful for all farming activities.

Human labor could still accomplish as much work as the first machines.

Mechanized farming required more capital and fewer laborers.

Giải thích

Tác giả có ý gì khi nói rằng một số phát minh nhất định làm cho canh tác "thặng dư vốn hơn là hặng dư lao động"?

Cơ giới canh tác đòi hỏi nhiều vốn hơn và ít lao động hơn.

Chọn D